I'm using a battery charger for charge the AA size batteries used in torch lights and in toys (normal batteries what is available in India). I want to know how much of AC electricity will be used to charge the batteries. The charger has auto cutoff so, once the battery was charged it will stop charging.
2007-03-16 20:14:57 · 2 answers · asked by Kannan 1 in Consumer Electronics ➔ Other - Electronics
Normally, the voltage the charger needs is printed on the case somewhere. Look it over and see what it says. If it doesn't say anything, you might be stuck. You could ask somebody you know that has something similar or ask at a store that sells such devices and see if they can help.
2007-03-17 05:43:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Let's say you have 2000mAh NiMH batteries or 2.0Ah batteries. If you're going to charge one for an hour (some chargers can do this), you need 1.3V x 2.0A or 2.6W of power. Chargers for low voltages like that aren't very efficient compared to higher voltages (like 9V), so figure only 70% efficiency. or 2.6W/0.7 = about 3.7 W input power. If you charge 4 batteries, that will be close to 15 W of power for the hour.
It will take 66 2/3 hours of charging to equal 1 kWh -- the standard for electrical power rate calculation. In the US, that would cost at most about $0.25 (twenty-five cents).
Well worth the investment, considering how much 66 new sets of 4 alkaline batteries would cost (at least $200.00 US @ $3.00 per pack of 4)
2007-03-18 20:43:21 · answer #2 · answered by sd_ducksoup 6 · 0⤊ 0⤋