How many watts are in car bartteryes?

Answer 1

varies, go out and check on top of battery, should have sticker that says cold cranking amps. all batteries should run 12.6 volts, do the math from that.
watts = volts * amps , take the CCA (cold Cranking amps) number on the Battery and multiply it by 12.6

No one answer, as there is no one car battery. Most are 12 volt batteries, but that can really be anywhere from about 13.2 to 11 volts. A standard large battery will have ABOUT 50 amps of current. Multiplying volts times amps equals watts. 12 x50= 600 watts. HOWEVER- you cannot draw that much power for more than a few seconds. Heat buildup would damage battery.