We can provide UN38.3 test service to our customer. We own a national standard UN38.3 testing lab. What to consider when designing Lithium Batteries?īluetooth Technology for Lithium-ion/LiFePO4 Batteries Please also read Safety Instructions for NiMH Batteries Besides, the more you use and charge NiMH battery, relatively the more cycles you will get. If you use NiMH battery properly (charge and discharge within battery's specification, no over-discharge under 1.0V/cell, immediate charge after use), it will last for 500-1000 cycles, which is around 2-3 years. If a battery has 1000mAh capacity and another one has 2000mAh, the second battery can provide 2x using time, of course, it will take 2x time to charge, assume using the same charger. For same size battery, the more capacity the better, because it can run for longer time. MAh means mili Ampere Hour, Ah means Ampere Hour. MAh or Ah is the measurement of energy storage capacity of the battery. If you do not plan to use NiMH batteries for a while, please fully charge them every 3 months to maintain your batteries. The self-discharge is 5-20% on the first day and stabilizes around 0.5-4% per day at room temperature. The self-discharge rate varies greatly with temperature, where lower storage temperature leads to slower discharge rate. Self-discharge is caused by internal chemical reactions. NiMH batteries can self-discharge over time. After a while, I found my battery is dead, why ? What is the shelf-life of NiMH battery ? I brought a new NiMH battery, I didn't use it very often. Shelf-Life / Self-discharge / Maintenance Issues That is another reason you might not get 100% capacity from NiMH batteries. NiMH cells are often used in digital cameras and other high-drain devices, mainly because they outperform primary batteries like alkaline batteries. Though they can pop if overcharged too much, Lithium-ion batteries can potentially blow up. Due to the electronic noise and voltage fluctuation, sometimes -ΔV can't detect the small voltage drop accurately, it might stop charge earlier before battery is full. NiMH batteries have a lot less active materials when compared to Lithium-ion batteries. The -ΔV will detect the small voltage drop and stop charge the battery. ![]() ![]() Ni mh full#When a battery reaches its full charge, its voltage decreases slightly. Most of NiMH charger using Negative Delta V (-ΔV) algorithm to monitor if the battery is fully charged or not. If wrong charger is used, it might cause explosion. The National Institute of Mental Health (NIMH) is part of the National Institutes of Health (NIH), a component of the U.S. ![]() Please DO NOT use other type of charger, like Lithium charger/LiFePO4 charger/etc., to charge NiMH batteries because the charge algorithm is different. Some Nicd chargers can charge NiMH batteries, but some can't. You must use NiMH charger for NiMH batteries. What kind of charger should I use for NiMH Batteries ? When using NiMH batteries, please stop use it when you feel it getting weak, especially for RC car batteries, Airsoft Gun batteries, etc. I brought a new NiMH battery and after using for several times, it can't hold charge anymore. So when you design a NiMH battery pack, please choose 20% higher capacity cells if your battery must run for certain time. The more cells inside the battery pack, the less capacity you will get, relatively. This is caused of unbalance cells in the battery pack. For example, if the cell's capacity is 10Ah, please expect the pack's capacity can only reach 80%-90% of 10Ah. We use NiMH cells to build a NiMH battery pack, why I can't get the same capacity of the sell ?Īssume you connect those cells in series. The charger’s indicator screen glows green when you have a full. And it’s easy to use: Load up the device, plug into the wall, and get fully loaded battery power when you need it. This handy device charges 2 or 4 AA or AAA NiMH batteries in 5 hours. If so, please fully charge the battery several cycles, then you will get full capacity. Keep the power you need at hand with the convenience of Energizer Recharge Value Charger. If you can get the right voltage but no full capacity, please follow the steps below:Ģ. I received the new NiMH battery, but after charge, I can't get the full capacity from the battery.
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