charging LI-On batt with triton charger  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> charging LI-On batt with triton charger
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charging LI-On batt with triton charger - 6/5/2008 12:26:38 PM   
Bobby Bo


 

Posts: 43
Joined: 2/19/2008
From: APO/fpo, AP, USA
Status: offline 		i have a li-on batt and a triton charger I. the batt is 7.4v 4800mah 4 cell the charger on the screen gives me an option of amps and voltage. im guessing its volts per cell not total. I select .4 amps book says .4a for 1200mah but i cannot go lower than 3.6v. i am setting it per cell or do i need to set the voltage up to 7.2 and .4a. is that correct or am i wrong. i tried charging it at .4a 3.6v took 1 min and it says charged but the voltage watch says its low in the green. the voltage reg is set at 5v output.

< Message edited by Bobby Bo -- 6/5/2008 12:33:39 PM >
       Post #: 1

RE: charging LI-On batt with triton charger - 6/5/2008 3:40:10 PM   
SilverFoxCPF


 

Posts: 58
Joined: 1/5/2008
From: Bellingham, WA, USA
Status: offline 		Hello Bobby Bo,

Li-Ion and Li-Po batteries operate at a different voltage than NiMh or NiCd batteries do. Each cell in a Li-Ion battery is a nominal voltage of around 3.6 - 3.7 volts. The Triton uses the cell voltage to determine how many cells (in series) there are in the battery pack you are trying to charge.

If you select 3.6 for Li-Ion or 3.7 for Li-Po charging, that means you battery pack has 1 cell in series.

If you select 7.2 for Li-Ion or 7.4 for Li-Po charging, that means your battery pack has 2 cells in series. From what you have said, this is what you have.

As far as the charging current to use, Li-Ion and Li-Po chemistry is often charged at 1C. C refers to the capacity of the battery pack. If your battery pack has a capacity of 1200 mAh, a 1C charge current would be 1.2 amps.

If your battery pack is really 4800 mAh, you may not be able to charge at 1C. I believe the Triton tops out at 2.5 amps, however charging at a slower rate is OK but it takes longer.

There is a possibility that the cells in series in your pack may get out of balance. That means that the voltage of each cell may end up different with each other. When the voltage of a Li-Ion or Li-Po cell gets too high, it "rapidly vents with flame." People have gone to using balancers while charging cells in series, but some battery packs don't have the electrical connections for hooking up the balancer. Since there is some danger involved while charging, it is best to charge in an area that won't be effected by flames, fire, and smoke. Also, it is important to stick around and attend to the charge to make sure things don't go wrong during the charge. Charging outside on a concrete driveway is pretty safe, as long as you are upwind from the battery pack during charging.

Tom

(in reply to Bobby Bo)
       Post #: 2

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