# Can I use a 220V incadescent bulb to drain a 12V battery?

I'm about to replace the batteries of my UPS. For safety, I'd like to drain the old batteries completely before disposing, but I don't have a large 12v load at my disposal.

Can I wire it to a 220V incadescent bulb (a.k.a. a 'lamp') to drain it?

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You might be better off using a car headlamp as it would drain the battery faster. –  Thomas O Oct 4 '11 at 11:29
Well I don't have a car headlamp lying around. –  Dave Van den Eynde Oct 4 '11 at 11:54
@OLin - A 60W bulb draws 0.25A at 230V. Same current at 12V would mean the bulb consumes only 3W. I haven't tested this, but my gut feeling says the filament doesn't heat enough to represent a 50$\Omega$ resistance. Heck, I can't even test it; all my 60W incandescent bulbs have been replaced with CCFLs! –  stevenvh Oct 4 '11 at 13:47