How To Charge Series: Charging NiMH Battery Packs on the ... You can charge the batteries from 2-8 pcs, depending on an input voltage. How to Charge NiMH Batteries: 12 Steps (with Pictures ... When fully charged the battery reads 8.37 volt. What is the recommended fully-charged voltage for NiMH AA batteries? Charging voltage for NiMH battery - Page 1 Nickel-metal hydride batteries contain a resealable safety vent built into the top, as shown in (Fig. electrical isolation between cells in typical battery applications. 7.2v NiMh - charger says 8+volts FLAT wtf? - RCCrawler And battery doesnt get warm. Top 10 Best Rechargeable C Batteries | Buyer's Guide 2021 Nickel Metal Hydride Battery Safety Notes | GlobTek AUTO STOP SMART BATTERY CHARGER: If you plug in power, this Rc charger will automatically detect the battery voltage and match the right current to charge, it will shut off when battery is fully charged in order to avoid over-charge.Charging time is 6-10 hours depends on your battery capacity. NiMH batteries stay at about 1.2 volts for almost 80% of their discharge cycle. Lithium iron phosphate battery - Wikipedia This voltage may be higher for old batteries. I read the charging current should be C/10 or 15 mA. NiMH battery technology, how to charge Nickel Metal ... This is possible because the SkyRC eN18 offers voltage ranging from 4.8 to 14.4V at 1.2 amp. PDF DC 6-7 Cell Ni-Cd & Ni-MH Peak RC Batteries & Connectors | Remote Control LiPo Batteries With the 1.2 amp charge rate, you can safely fast charge any 4-5 cell nitro car NiMH receiver's pack. 2. The nickel-metal hydride battery is designed so the oxygen recombination cycle described earlier is capable of recombining gases formed during overcharge Im using an old Nikko C5/mc charger which charges at 2400ma. First LED, show charging status, when the battery is full, it will be off. The number of cells in a battery pack determines its voltage. Leaving aside for the moment the wisdom- or otherwise- of using a wall wart as a charger in the first place, having charged the battery for a while now at 11 or so volts it does actually turn a motor over. When charged at the C rate single cell voltage may reach 1.6V. I noticed my Nimh packs get just a little warm after a 20-24 hour 125 mah charge, my readings under 1000mah load is usually 7-7.2V. A LiPo battery cell is flat and rectangle in shape, there is no "standard" physical size for a LiPo cell, although a lot of RC cars have been designed to accommodate a 6-cell NiMH battery which is generally 137x45x234mm give or take a few millimetres, so this commonly gets called the "standard size". For NiMH batteries, the voltage of the battery increases slowly during the charging process, until the battery is fully charged. The discharge voltage profile of a NiMH battery is considered "flat" (see Figure 3.7.2 C/10 Discharge Profile @ 25°C) and varies with the rate of discharge and temperature. Trickle charging is preferred (12-14 hours) to fast charging and will result in greater battery life and more recharges per pack. Note: After you have properly connected the battery to the charger, a "beep" will This worked brilliantly. Slow charging NiMH batteries: NiMH battery slow charging is not to be recommended. A lipo cell battery should never be discharged below 3.0V. Charging Energizer 2100 NiMH AAs in an hour usually results in a cell voltage of 1.4-1.45V However, I have a pack of 3000mAh SC cells, which after a 2 hour charge, usually results in a cell voltage of 1.35-1.4V / cell. Charging at 1 C is extreme and is likely to cause overheating and venting, regardless of what . I noticed that the voltage drop under that load can be almost .5V. Under a light load (0.5 ampere), the starting voltage of a freshly charged AA NiMH cell in good condition is about 1.4 volts. The 9.6V results after about 12 hours of normal usage. I don't want to toast my servos or my receiver (spectrum receiver). 3.7.2 NiMH Voltage. Second LED, connect the battery correctly. The Elite setup was for a 5 cell, 1400 mAh battery. Modern chargers accommodate both battery systems. Two cells is 2.8V so maybe your battery has a shorted cell. Hey - just charged a 6.0v 1400 mAh NiMH battery pack. Fully charged, it provides about 1 hour. Aging rechargeables tend to develop high internal impedance. At a C rate of 0.1C to 0.3C, the voltage and temperature profiles do not exhibit defined characteristics to trigger full-charge detection, and . This . The discharge voltage profile of a NiMH battery is considered "flat" (see Figure 3.7.2 C/10 Discharge Profile @ 25°C) and varies with the rate of discharge and temperature. . You will need to charge these battery packs before you first use them. Additional accessories include a voltage monitor, battery tester, lead extensions, and a charging bag. They may be called "6-cell" and "7-cell" packs, or called by their voltage: 7.2 volts and 8.4 volts (since 6 x 1.2 = 7.2, and 7 x 1.2 = 8.4). NiMH batteries stay at about 1.2 volts for almost 80% of their discharge cycle. So if you're trying to plan for the most extreme case, plan for at least 1 . This voltage falls rapidly to about 1.25 volts at 10% depth of discharge (DOD) and then remains almost constant until the cell is over 80% discharged. Charging a NiMH battery with this technique the charger knows when the battery is full and can discontinue charging, hence saving the overcharging issue. 3. The actual voltage will depend on how charged the batteries are. Nominal voltage of single cell is 1.2V, but fully charged cell has an open-circuit voltage up to 1.5 volt. How do you calculate the NiMH battery charge rate? A: In fact, over the course of their discharge, alkaline batteries actually average about 1.2 volts. Note that the NiMH has a somewhat lower voltage at full charge than does the alkaline battery, but has a flatter discharge curve. If the cell voltage is higher during charging (eg 1.6 or 1.7 volts), the cell is faulty and should be discarded. Plug the battery's capacity into the equation and multiply it by 1.2, or 120%, since NiMH batteries require more power to charge than what they output. 2. To preserve battery life the best practice is to use a timer to prevent overcharging to continue past 13 to 15 hours. Both chargers work with NiMH and LiPo batteries. A: In fact, over the course of their discharge, alkaline batteries actually average about 1.2 volts. When charged at the C rate single cell voltage may reach 1.6V. The most common way to determine when a NiMH . cell type: NiMH cell size: Sub-C number of cells: 6 Conditions nominal voltage: 7.2 V max. It supports charging batteries up to 15 Cell NiMH Batteries and has a bunch of settings and configurations for different battery types too. Improved low self discharge function could help to maintain the capacity up to 75% even if 3 years non-use. $ 21 99. At 50% the reading will be 2.03 VPC (Volts Per Cell), and at 0% will be 1.75 VPC or less. Under a light load (0.5 ampere), the starting voltage of a freshly charged AA NiMH cell in good condition is about 1.4 volts; some measure almost 1.5 volts. I have three sets (12) of 1600mAH AA batteries by Panasonic. The package for the battery says fully charged will read 8.4 v. So that's 7 cells, 8.4/1.2. For example, the average runtime for a 4.2V 2000 mAh NiMH battery is around 12 minutes. 4). While on float charge, lead acid measures about 2.25V/cell, higher during normal charge. A fully charged NiMH pack will be right around 7.2v where as a Lipo will be 8.4. Traxxas NiMH batteries are offered with 6 cells (7.2 volts), 7 cells (8.4 volts) or 8 cells (9.6 volts). Also read that NiMH is 1.2v/cell. When the charger lights go off and I test the batteries, they usually read around 1.38x volts or so. I noticed my Nimh packs get just a little warm after a 20-24 hour 125 mah charge, my readings under 1000mah load is usually 7-7.2V. The BQ25171-Q1 is an automotive rated, 800-mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO 4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery.The system load can be placed in parallel with the battery, as long as the average system load does not prevent the battery from charging fully within the . TRA2889X Traxxas 5000mAh 14.8v 4-Cell 25C LiPo Battery (155mm) This is the . The nominal voltage of lead acid is 2 volts per cell, however when measuring the open circuit voltage, the OCV of a charged and rested battery should be 2.1V/cell. The completely charged voltage is 11.3V or 1.41V per cell (I measured 1.42V unloaded for a fully charged cell). Option: if the discharged battery voltage is above 1.0 Volts/cell, discharge the battery to 1.0 V/cell then proceed to rapid charge. RC Car Battery Charger 4.8v 7.2v 8.4v 9.6v Nimh NiCd Battery Packs Charger, Nimh Nicd Airsoft Battery Charger, 4.8v 6.0v Rc Receiver Rx Battery Pack Charger 4.4 out of 5 stars 928 $12.90 $ 12 . For a 2400 mAh of the same voltage, the run time is around 12-15 minutes. I've seen one, also using hitec servo, using a Lifepo battery which is . The cutoff for a Lipo should be 6v where as a Nimh pack will run well below that (although slow). One NiMH cell delivers 1.2 volts, and NiMH batteries will typically come with six or seven cells. It's different with LiPos. Really not. The minimum voltage you need to get a full charge varies with temperature--at least 1.41 volts per cell at 20 degrees C. Even though continued charging at C/10 does not cause venting, it does warm the battery slightly. This is the Traxxas 1200mAh NiMH 5-Cell 6-Volt Hump Pack Receiver Battery for Traxxas Nitro vehicles. Even a healthy nicad or NIMH might go to 1.6 or 1.7 V. (When taken off charge it drops to 1.45 or so, settling down to 1.35 or 1.4 after a few hours.) Then you should perform a forming charge before you quick-charge it, to condition and fully charge the individual cells. A single NiMH cell delivers 1.2 volts, and NiMH batteries are most commonly offered with six or seven cells. NiMh batteries are best fast charged then trickeled for the remaining 30 Minutes . Float charging has the advantage of keeping the cells fully . No, it's 6 cells at ~ 1.4 each. Delta temperature (dT/dt), temperature threshold, peak voltage detection, negative delta voltage, and simple timers are among the methods used to determine when to stop charging NiMH and NiCd batteries. Confused with servo's maximum voltage. 【High capacity performance batteries】HiQuick Ni-MH AAA 11100mAh and AA 2800mAh rechargeable batteries are durable for daily device, which can be cycled up to 1200 times. NiMH Charging Basics A NiMH cell has a nominal voltage of 1.2V. The project is the NiMH battery charger circuit with automatic cutoff when fully charged. Voltage 3.8V/cell 3.85V/cell 3.7V/cell 3.3V/cell N / A N / A N / A Allowable Fast Charge ≤ 1C ≤ 1C ≤ 1C ≤ 4C ≤ 1-2C ≤ 1-2C ≤ .04C Min. Be sure to only charge your NiMH batteries for a period of fewer than 20 hours as prolonged charging can harm your battery! After that, the voltage decreases, which indicates to an intelligent charger that the battery is fully charged.Such chargers are often labeled as a ΔV, "delta-V," or sometimes "delta peak" charger, indicating that they monitor voltage change. When the car is flat the battery reads 7.29 volts. Although not a new device, the LM317 is still a high-performance regulator. The minimum voltage you need to get a full charge varies with temperature--at least 1.41 volts per cell at 20 degrees C. The best charging practice is to use a timer to prevent overcharging to continue past 16 hours. What is the correct voltage for fully charged AA NiMH batteries? LiPo. . A fully charged lipo voltage is 4.2V per cell (HV lipo can be charged to 4.35V). It's been a long time since it has been fully charged. Battery is 9V, 150mAh. The output of the LM317 is 1.25V and it needs an input at least 2V higher, so its input must be at least 3.25V. Typically, a NiMH cell is charged with a constant current until a terminating condition is encountered. First LED, show charging status, when the battery is full, it will be off. With voltage changes of only about 5mV at full charge rates, the smaller changes arising for a slow charge are virtually impossible to detect. Trickle Charger usually generates 500Mah and the battery is 2000Mah, therefore 4 hours for a fully charged battery is enough. Texas Instruments bq25171-Q1 Linear Battery Charger is an automotive rated 800mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO 4, in addition to 1-cell up to 6-cell NiMH battery applications.The device has a single power output that charges the battery. This voltage may be higher for old batteries. Using charge rates of between 0.1 and 0.25C do not provide the indicators needed to detect the end of charge. Both chargers work with NiMH and LiPo batteries. The 2 most commonly used rechargeable battery chemistries today are: NiMH (Nickel Metal Hydride) and NiCD (Nickel Cadmium). The 20W Sport charger features an easy-to-use 2-button design, while the 60W Rapid charger offers extensive programming to meet your charging needs. This high quality 5-cell hump pack uses proven nickel-metal hydride cells and is rated at 1200mAh. . High performance battery chargers like the Traxxas EZ-Peak line with a minimum charge rate of 4 amps are recommended to completely charge high-capacity (3000 - 5000 mah) NiMH batteries in one cycle. An alkaline battery or NiMH cell in a standard AA size has something about 2000 to 3000 mAh. 2. These may be referred to as "6-cell" and "7-cell" packs, or they may be referred to by their voltage: 7.2 volts and 8.4 volts (since 6 x 1.2 = 7.2, and 7 x 1.2 = 8.4). It is done with a linear charge of 1/10 C (330mA) for 20h without voltage . The runtime is measured from when it's fully charged to when there is no charge. Specs says 4.8v & 6v. I have always been wondering if that is a bit too low, but never had any hard number to go by for the last couple years. Cells can be charged at this rate no matter what the initial state of charge is. Ask Question Asked 3 years, 10 months ago. While a 4 cell is 6v at fully charged but rated as 4.8v. The charger can fully charge 1-8 any number of AAA 1100mAh batteries in 2 hours and fully charge 1-8 any number of AA 2800mAh batteries in 4.5 hours. Additional accessories include a voltage monitor, battery tester, lead extensions, and a charging bag. Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery. Charging 6- or 7-cell Sub-C Ni-Cd or Ni-MH Battery Packs 1. Alkaline batteries (non-rechargeable) are a 1.5 Volts. According to Wikipedia. Keeping lead acid much below 2.1V/cell will cause the buildup of sulfation. It is difficult, if not impossible, to slow charge a NiMH battery. My biggest problem with Nimh is the V drop when you are fully charged the night before you go flying. In the circuit has two LED indicators. Answer (1 of 2): If your NiMH battery was reading 0.9V, it was at its discharge end point. Most inexpensive manual timer chargers that are available (non-peak chargers) have a 15 to 30-minute timer and a preset charge rate of 4-amps or less. Full detection is done (as you have found) with negative voltage change when charging with a constant current. I use a Hobbico Accu-Cycle Elite that shows the progress and final details about the charge. Our top pick for NiMH battery charging is the iMax B6 Battery Charger. The other category of NiMH charger is called "Delta Peak". Fast charging generally produces higher voltages. However, the voltage for charging is usually around 1.4-1.6 V per cell. If the discharged battery voltage is less than 1.0 Volts/cell start with a C/10 charge. You'll often hear discussions about the so-called 'memory effect' exhibited by NiCad cells. It drops as soon as you start using the cell. In the circuit has two LED indicators. The project is the NiMH battery charger circuit with automatic cutoff when fully charged. The main difference is that an alkaline battery starts at 1.5 volts and gradually drops to less than 1.0 volts. So, the 9V 180 mAHr NiMh battery can be fully charged controled by the 9.0 volts terminal voltage ,and 20mA when the ni-mh battery is new .but, after some cycles the fully charged voltage will be higher than 9.0V. So charge at 7*1.41v = 9.9v @ 15mA? Then divide that answer by the charger's C-rate to find out how long it will take for your battery to fully charge. Once alkaline batteries discharge to 50% capacity, it . The system load can be placed in parallel with the battery as long as the average system load does not prevent the . You can charge the batteries from 2-8 pcs, depending on an input voltage. 90 $19.90 $19.90 NiMH batteries can be discharged completely without harming the battery, and they do not need to be charged before storage. The voltage of a completely charged NiMh cell is in the 1.45-1.5 volts range. Add to Cart. The working voltage on both of these battery chemistries is 1.2 Volt (with the exception of the 9 Volt NiMH or NICd. 3. Its output voltage is essentially immune to fluctuations in load, supply voltage and temperature and this makes it ideal as the central element in a float charger for NiMH cells. 1.4V to 1.6V per cell at 1C is the recommended charge rate with temperature monitoring . Check out our latest update on how to use TB6B videos:-----Unboxing: . You can charge 6-8 cell NiMH battery packs as found in most electric cars, trucks, and buggies. charge voltage: 9.0 V at standard charge (0.1C / 20°C) capacity Now consider the charger still needs to have enough voltage to actually 'shove' electrons in, it actually needs to be above 9 volts. All NiMH ( Nickel Metal Hydride ) batteries as well as all Nicad Batteries are all 1.2 Volt for consumer use. So you can be assured that these are the batteries that everyone . Trickle charge rate of less than 0.025 C (C/40) is recommended after battery fully charged. Batteries: 6 Packs C cell 5000mAh 1.2V Ni-MH rechargeable batteries. Connect the charger to the 12V power source. Float Charger For NiMH Cells. A 3.6V Ni-MH battery is 4.2V when fully charged. Once alkaline batteries discharge to 50% capacity, it . A fully charged cell supplies an average 1.25 V/cell during discharge, declining to about 1.0-1.1 V/cell (further discharge may cause permanent damage in the case of multi-cell packs, due to polarity reversal). The nominal voltage of NiMH and NiCd batteries is about 1.2 V/cell, and they usually should be charged up to 1.5V to 1.6 V per cell. As a fully charged battery is discharged the voltage begins at about 1.5 volts followed by a sharp drop to around 1.3 volts. The common sense of lipo voltage as below: 1. The 20W Sport charger features an easy-to-use 2-button design, while the 60W Rapid charger offers extensive programming to meet your charging needs. Voltage is the normal parameters for a cell. Nominal voltage of single cell is 1.2V, but fully charged cell has an open-circuit voltage up to 1.5 volt. The best way to calculate the NiMH battery charge rate is by knowing the mAh of the battery. The lithium iron phosphate battery (LiFePO 4 battery) or LFP battery (lithium ferrophosphate), is a type of lithium-ion battery using lithium iron phosphate (LiFePO 4) as the cathode material, and a graphitic carbon electrode with a metallic backing as the anode.The energy density of LiFePO 4 is lower than that of lithium cobalt oxide (LiCoO 2), and also has a lower operating voltage. 1) Its rated voltage. My biggest problem with Nimh is the V drop when you are fully charged the night before you go flying. Most round cell batteries were tested to about a .90 - .85 cell voltage, but others ran them down to .80 for better numbers. See this discharge curve - At 0.9V the cell can be considered dead flat, and its voltage will fall practically vertically to zero with any load. A fully charged NiMH cell will deliver almost 1.5 V, so, for example, a "6V", 5-cell pack can measure over 7 volts after being charged, and it can fall well below 5 volts when the pack is drained. LiPo battery packs are composed of flat 3.7-volt cells. Cell Size: AA 6-Cell (3-Row 2-Line) | Connector Type: Standard Female Tamiya Will provide 3-4 times working time than your original 7.2V 700mah Ni-CD battery pack (original 7.2V 700mah nicd capacity working time 25-30 minutes when fully charged) Adopt UL listed (E316286) 22 AWG cord wires ensure its quality and safety. The charger is supposed to be able to 'jump start' batteries that are in a 0v state and this worked for 3 of the 6. Today, I will show you the lipo voltage chart show the base voltage from 1s to 6s and the relationship of voltage and capacity. 3.7.2 NiMH Voltage. Connect the charge lead of the charger to the connector of the battery pack. A NiMH in a NiCd charger would overheat, but a NiCd in a NiMH charger functions well. As a fully charged battery is discharged the voltage begins at about 1.5 volts followed by a sharp drop to around 1.3 volts. A fully charged 5 cell nimh is 7.2v but rated as 6v. Once you have chosen the energy, you can specify the capacity by the amp-hour rating. ProCyco technology, providing super long cycle life, can be recharged up to 1200 times, high quality with professional care. As we know, For ni-mh battery ,the fully charged voltage will become higher after some cycles. I noticed that the voltage drop under that load can be almost .5V. Charging voltage should be ~ 1.41 v per cell. How to make a 9V Ni-MH charger? This refers to the claimed tendency of cells not to deliver their rated voltage when placed in a charger before being fully discharged. Select the charge rate for charging your battery pack. The total voltage from the mains adapter must be at least 4.2V + 3.25V= 7.45VDC . With LiPos, this is different. with negative voltage change when charging with a constant current . With a battery voltage of 1.2V up to 1.5V will correspond to 2 to 4 Wh with each battery. Second LED, connect the battery correctly. Then trickle at 0.05C . Discharge Voltage 3.-3.3V/cell 3.1-3.4V/cell 2.9-3.2V/cell 2.6-2.9V/cell .1-1.1V/cell .1-1.1V/cell 1.8V/cell Standard Battery Parameters WHEN ADJUSTING YOUR RDX1 PRO CHARGING PARAMETERS, BE SURE . There is no specific way of knowing the charge rate for NiMH batteries. Therefore, stacking three NiMH cells together results in a battery pack with a nominal voltage of 3.6V and a maximum voltage of 4.5V. I found 12 Nimh batteries that had been stored for rather a long time (at least 5 years) and only about half would charge in my 'intelligent' charger. So for the charger to JUST MATCH the voltage of a fully charged pack, it'd hafta be darn near 9 volts. If the discharged battery voltage is above 1.29 V/cell start with a C/10 charge. A fully charged Ni-MH cell will read 1.5V, so with 6 cells in the X9D+ battery, that is a maximum of 9V across all the cells. Long slow trickle charges cause "memory" . 2) Its rated current. After the charge the display shows that the voltage was charged to 7.49 v and 1759 mAh. During charging a battery shows a rise in voltage. I've got Hitec HS-845hb & Hs-5645mg. It answers one question and that's that the charging voltage needs to be from 1.4 to 1.6 per cell, ie 11.2 to 12.8 for my 8 cell battery. But it doesn't take a lot of charge to push it back up over . The internal charger of the X9D+ is stopping just short of that, probably so that there is a little bit of a safety margin. Specific gravity will be about 1.265 for a fully charged cell, and 1.13 or less for a totally discharged cell. The main difference is that an alkaline battery starts at 1.5 volts and gradually drops to less than 1.0 volts. Ive just got a new 7.2 volt 3000 mah battery. Trickle charge rate of less than 0.025 C (C/40) is recommended after battery fully charged. The cells are stacked and enclosed in a tough, semi . Charging might cause a reading high as 2V. The charger seems to fully charge in 1/2 an hour which seems too quick to me. Lead Acid. Once charged they average 1.3 to 1.4V . With charger top 10 Model... < /a > There is no way... No, it begins at about 1.5 volts followed by a sharp drop to around 1.3 volts PRO Parameters... Tra2889X Traxxas 5000mAh 14.8v 4-Cell 25C lipo battery ( 155mm ) this the. 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Mah battery C is extreme and is likely to cause overheating and venting regardless. Also using Hitec servo, using a Lifepo battery which is is recommended after battery fully.. ( although slow ), when the charger seems to fully charge in 1/2 an hour which too... But has a flatter discharge curve discharge to 50 % capacity, it & # x27 ; trying! Should be ~ 1.41 V per cell ( HV lipo can be almost.5V 8+volts flat wtf seems quick. Battery increases slowly during the charging current should be 6v where as a charged. S maximum voltage maximum voltage to maintain the capacity up to 1200,... 2 to 4 Wh with each battery they usually read around 1.38x volts or so 1.41v = @. And 0.25C do not provide the indicators needed to detect the fully charged 6 cell nimh voltage of charge so you... Battery Parameters when ADJUSTING your RDX1 PRO charging Parameters, be SURE to push it up... Pack will run well below that ( although slow ) voltage monitor, battery tester, lead acid measures 2.25V/cell! 14.8V 4-Cell 25C lipo battery packs as found in most electric cars, trucks, and a bag!, be SURE most electric cars, trucks, and a charging bag charge! At full charge than does the alkaline battery starts at 1.5 volts and gradually drops to less than 1.0.. A charger before being fully discharged 14.8v 4-Cell 25C lipo battery ( 155mm ) this the... First LED, show charging status, when the battery is fully the. & quot ; be SURE to only charge your NiMH batteries will typically come six. Of the battery reads 7.29 volts top, as shown in ( Fig need to charge these battery is! 6 cells at ~ 1.4 each is usually around 1.4-1.6 V per cell HV... A resealable safety vent built into the top, as shown in Fig! To plan for the battery is 4.2V when fully charged a sharp drop to around volts... 4.35V ) cell ( HV lipo can be assured that these are the batteries everyone... 80 % of their discharge cycle using an old Nikko C5/mc charger which charges at.. Are the batteries, the voltage drop under that load can be assured that are... At full charge than does the alkaline battery, but has a bunch of settings and for... Option: if the discharged battery voltage of the battery is full, it 1.5 Volt volts and.: //www.mascot.no/blog/archive/how-does-one-charge-nimh-batteries-correctly/ '' > 7.2v NiMH - charger says 8+volts flat wtf where... Than 1.0 volts charges cause & quot ; memory & quot ; the run time is around 12-15....