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Let me clear this up for you.
The formula for battery charging time is this:
Divide the capacity of the battery being charged by the output of whatever is charging it, then you get a certain number. Multiply that number by 1.2 (You have to increase the charging time by 20% due to battery inefficiency), and then multiply it by 60 to get minutes. Then you will have another number (indicating minutes), you will have to multiply anything after the decimal by 60 to convert to seconds.
Example: Let's say the capacity of the battery you are charging is 70 mah, and the output of the charger is around 500 ma.
Divide 70 by 500 to get 0.14, then multiply that by 1.2= 0.14 times 1.2= 0.168.
Then, you have to multiply that by 60 to get minutes, so 0.168 times 60 is 10.08 minutes. Now, after the decimal is .08, so multiply that by 60 to get 4.8, rounded up to 5, So, you have to charge the 70 mah battery at a rate of 500 ma for 10 minutes and 5 seconds.
Credit goes to actofgod & Namuna for this strategy.
Chuckster...
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