Now you have a project and you want to power it off of a rechargeable lithium polymer Battery, but so many different rechargeable lithium polymer Battery in the market. how do we get the best based on the project?

lithium polymer battery 402030

lithium polymer battery 402030

The two easiest cases are the extremes:

  • Is your project very power-hungry? Projectors, large sound systems, and motorized projects all draw on the order of amps of current! You’ll want to go with lantern cells (one-time use) or lead acid batteries (rechargable). If you are planning to be somewhat ‘abusive’ to the battery (heavy-usage, running it down all the way) you may want to look at “marine deep cycle” batteries.
  • Is your project super-small, like an inch on each side? You’re going to have to go with a lithium coin cell (one time use) or little lithium-polymer cells like the ones used for tiny RC planes.

Here are some other very popular cases:

  • Do you need to make a lot of these things? Go with inexpensive alkaline batteries in popular sizes.
  • Need to be user-servicable? 9V or AA size batteries are universal!
  • ~5V input necessary? 3 Alkaline (4.5V) or 4 NiMH cells (4.8V) will get you pretty close – check your circuit to see if it’ll run at these slightly lower voltages
  • Making a ‘rechargeable battery pack’? Use a battery holder from your local hobby/electronics/repair shop and stick with NiMH batteries, then recharge them with a high quality charger.
  • Want to replace alkalines with rechargeables? Test to make sure that the lower voltage won’t make the device unhappy.
  • Need to stack batteries? Remember to stack batteries only if they have matching C and Ah capability, if you stack a 9V and a AA to make 10.5V the 9V will drain in 1/10th the time leaving you with 1.5V.
  • Want your rechargable batteries to last a long time? Use a high-quality charger that has sensors to maintain proper charging and trickle charging. A cheap charger will kill off your cells

Cylindrical LiFePo4 Battery Packs

How to choose the correct razor battery?

There are too many models of Razors on market , we can not tell you which battery is for which model. However, you can find a suitable battery from our website by yourselves following the procedure blow:

Get a ruler and voltage meter in hand
Determine your battery pack voltage — Account how many cell in your original battery pack.  Each cell has 1.2V.  For example, if there are two single cells in your pack, its voltage is 2.4V.  You can double check battery voltage by voltage meter if battery is not dead.
Determine battery pack’s size  ( length x width x Height)
Choose a battery pack from Razor battery with smaller size and same voltage
Please be advised  as long as battery voltage is correct, and battery pack can put in your razor, you can use it to replace your original battery
Whatever NiCd battery or NiMH battery — NiMH battery is better
Whatever mAh rating,  higher mAh always is better
Whatever  shape same or not,  as long as it can put in razor
Warning:  Battery pack must be connected to razor with correct polarity, e,g positive to positive and negative to negative.  Please double check polarity on the both of Razor and battery before using.


How to choose the battery packs for bike lights?

Before replacing  a rechargeable battery for bike light,  you must know following data
What kind of light do you have ?   Halogen Light or HID light ?
If  it is halogen light, what are   Voltage and  Wattage on your bike light?  6V or 12V?  5W or 15W?
If it is HID light, what are Voltage on your Light?   12V system or 14.8V regulated ?

Battery Packs for Halogen Bike Light

Halogen bike lights have two types:  6V or 12V.  Please make sure light bulb voltage before choose battery, otherwise, light bulb may burn out immediately
Halogen light has much lower cost than HID, and drain more energy from battery.  NiMH battery pack is suitable for all Halogen light.
In order to get better brightness and longer burn time, you can overdrive light up to 25% at voltage, for example
6V halogen light  can use battery packs from 6V to 7.4V
12V Halogen light can use battery packs from 12V to 14.8V
However, overdriving may reduce bulb life at same percentage  ( Halogen light bulb is inexpensive )
Li-Ion battery pack can be used on halogen bike light, but you have to make sure PCB on Li-Ion battery pack can pass through higher higher initial current ( 3 time higher than normal current)

Battery Packs for HID Bike Light.

HID light three times higher brightness than halogen light at same power wattage, but much more expensive.
HID light must be fired between 9V -13.8V.  If battery voltage is higher than 13.8V , the bulb may burn out quickly.  So usually HIH lighting system has voltage controller to regulate voltage at 11V – 13V.
If  using 12V-13.2V NiMH battery pack  or 11.1V Li-Ion battery pack to drive HID light, you can drive any HID bike light on the market without voltage controller
Please never drive HID light by 14.8V  or higher voltage battery pack without voltage controller.\
Li-Ion battery is the most suitable for HID light because its less weight and higher energy
Usually, HID manufactures don’t  list  all data on their battery pack , and they want to earn your money on replacement battery.  Doesn’t matter.   you can email us  your light’s brand name and P/N to, our engineer will suggest you a right battery pack immediately at 50% or more less cost.  Also, you can find battery data from below list.

How to Calculate burn time of battery pack for bike lights


ebike battery pack

ebike battery pack

Battery burn time is decided by battery capacity , e.g. mAh or Wh. Higher mAh  or Wh will provide more burn time
The time can be estimated as the following:
Burn time ( Hours) = Battery Wattage Hours (Wh) / BLight bulb Wattage (W)
here , Wh =  Battery voltage ( V) x  Capacity  (Ah),     1000mAh= 1Ah
for example, battery pack ( 14.8V , 4.8 Ah) has 72Wh energy, can burn 13W light for 5.46 hour


more Questions?  please contact us by click here and send inquiry to Coremax.