Quote Originally Posted by Rolly Talingdan View Post
Very good idea. Just be aware that not all UPS uses 12volts dc as supply voltage. When absolutely certain that the UPS has 12 volts dc, your car battery will even charge faster if your 220v ac supply into your wall outlet.
We should always use a Voltmeter so we are certain that it has 12 VDC or even 14VDC available from the charging terminal of the UPS we are going to re-use.