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ko4nrbs

Hobby Charger Power Requirements Updated 2/20/17!

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A lot of Hobby Charger manufactures list the charging current of their chargers instead of the wattage capacity. It's up to you to go through the charger's specifications until you find it.

 

Here is a calculator that can do the math for you:

http://www.scriptasylum.com/rc_speed/chargercalc.html

 

Calculating the power (wattage) capacity needed when charging Li-Ion cells with a Hobby Charger.

Example: Works for Series or Parallel connected cells.

http://www.electricianmath.com/seriesparal...tage_series.htm

http://www.electricianmath.com/seriesparal...ge_parallel.htm

 

The charger will charge the cells up to 4.2 volts. Use the charging current recommended by the manufacture of whatever battery you are charging. As an example if using 1 amp charging current each individual cell's charging power will be 4.2 watts (1 amp X 4.2 volts). If charging 4 cells in series the total power is 16.8 watts. Add another 20% to account for losses in the charger or 3.36 watts. So the total power required to charge the 4 cells is 20.16 watts. We need a charger that is a little over 20 watts total capacity in order to charge these 4 cells. I would error on the side of caution and go with at least a 25 or 30 watt charger.

 

Good examples of how people are coming up with ways to charge individual cells outside of battery packs.

http://budgetlightforum.com/node/1767#comment-59475

 

I'm no authority on any of this just passing along what I have learned.

Bill

Edited by ko4nrbs

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Explanation on a Battery's "C" rating.

http://2bfly.com/knowledgebase/battery-cha...ttery-c-rating/

 

Don't forget when charging batteries in Series, i.e. Li-Ion, etc., that the charger sees the batteries as one big battery. A 4S configuration is 4 batteries in Series, 6S is 6 batteries in Series, and so on.

 

 

Bill

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