How much does it really cost to charge Batteries?

Question

OK. I own a digital camera and other gadgets that use betteries.

I've been using rechargable batteries for the past 2 years. So, here's my question;
How much does it really cost to charge rechargable batteries?
I use rechargable batteries from ENERGIZER that take about 13 hours to get a full charge.
So, I don't know; Is there any way to find this out?
My dad is always complaining about the electric bill,when he receives it, since it's well over $500.00 every month.
[I wouldn't blame him since we are always using several computer's at the same time.and have every single electronic thing on..]
SO ELECTRICITY = MONEY;

HOW MUCH ELECTRICITY DOES IT TAKE TO CHARGE NI-HM BATTERIES FOR 13 HOURS STRAIGHT, = MONEY WISE?

I GOT MYSELF CONFUSED ;p

I know rechargable batteries last more, and are rechargable for long time use, but are they really cheaper than regular batteries in the long run?

Answer 1

To calculate battery charging costs you need to know how much energy in your area is worth. This can be found on the electric bill as price per unit (kWh or equivilant). Next yopu will need to work out the draw of your battery charger, this can be done be using the nergy complinace panel on the back or side. This should list the amp draw and voltages to be used, if it also lists the wattage then great but most don't. Multiply the output voltage and amperage to get your watts used per hour. Then you will need to times this by your unit price (remeber that this is kiloWatt hours and not Watt hours so you will have to devide your watts per hour by 1000 to get the right result). This will give you your cost per hour to charge your batteries. Then you will need to times this by the number of hours that you charge for. The calcultaion is below, Hope this helps.

Unit price = $0.15/kWh
Volts=6
Amps=0.5

V*A=3
((V*A)/1000)*0.15=$0.00045/h
0.00045*13=$0.00585 or 5.58cents for 13 hours.