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Category : How to Choose a NiMH Battery Pack?

How to Chhose a Battery Pack

  • First of all, you must get to know your device:
  • What is device's input voltage? ( V)
  • What is its power consumption ( Wattage ) ?
  • What is Maximum current drain ( A) ?
  • What is your expected running time by a battery pack ?
  • Decide battery pack voltage you will choose
    • Battery pack voltage must be equal or a little higher than your device??s need.
    • If you need a exact voltage, which battery pack can not provide, you may consider to use a DC-DC regulator
  • Decide Battery pack's Capacity  ( mAh or Ah)
  • Battery capacity is depended on how long you need to run your device ( hours ), which can be calculated as the follow:
  • ( Ah) = Device's Wattage (W) x Time to run ( Hours) / Battery Voltage (V)
  • For example, if using a 12V battery pack, and run 10W DC device for 10 hours, you need choose a battery pack with capacity > 8.3Ah, e.g

( 10x10)/12 = 8.3

  • 1000 mAh = Ah,  higher mAh will provide longer running time.
  • Decide Battery pack??s Max. discharging current
    • Before order battery pack, you must pay attention on battery pack??s Max. discharging rating on the specification or description. Please don??t think any battery can take any current drain.
    • You shall know your device??s max. discharging current. If you don??t know , you must measure it by a multi-meter.
    • The battery pack??s Max. discharging rate of the chosen Battery must be higher than that device requires
  • Choose Li-Ion, NiMH or Lead acid battery?
  • All types of rechargeable battery will work for you. Question is size and weight. The table below lists the advantages and disadvantages of these batteries for your reference






Shelf Life


( oC)



per cell

Lead Acid


Very Heavy

-65 to 80




Nickel Cadmium



-20 to 65




Nickel Metal Hydride



-10 to 65




Lithium Ion



-20 to 60




Lithium Polymer



-20 to 60




  • Li-Ion batteries has the highest energy density ( mAh/weight), and become more and more popular. However, Li-Ion may explode and cause a fire if it dose not use properly. Please read our safety warning.
  • In current stage, we always suggest customer to use NiMH battery pack for high current application ( < 1C rate ), not Li-Ion , because Li-ion ?®s protection in high current application still is not matured yet
  • Choose a Battery Charger
    • Please always follow our suggestion to choose a smart charger. So called smart charger must has automatic power cut-off function when battery is full.
    • Never use NiMH battery charger for Li-ion battery pack, it will cause battery exploded
    • Always charging your battery with attention, and put battery in a fire-proof container ox box to avoid any accident.
  • Understand risk to use NiMH and Li-ion battery. Please read our safety warning before buying a battery
What to consider when designing Lithium Batteries?
Bluetooth Technology for Lithium-ion/LiFePO4 Batteries
UN 38.3 Safety Test

We own a national standard UN38.3 testing lab. We can provide UN38.3 test service to our customer.

If you want to set up your own lab, we also provide UN38.3 & IEC62133 equipments and onsite training. Email us for the quote and lead time.
Lithium Battery Shipping Regulation
Recommendations on How to get ≤30% Rated Capacity for Shipping
Thermal Abuse Test for IEC62133
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