If you were charging a "sealed" battery (one that you can't open the caps to the cells) and you heard it "bubbling" you were probably overcharging it. The best way to charge a battery is long and slow. Never let it get hot while charging. 8 hours on a high rate of charge was probably too much. Be very careful to never charge a battery that has been frozen, some of the plates may have shorted together and in extreme cases they have been known to explode! If you have the time hook to a trickle charger and check daily till fully charged. Load test to measure the amp-hour capacity of the battery. If it is less than 80% of listed capacity consider replacemant. You should always remove from car while charging. Never smoke or use open flame near a charging battery, it is giving off hydrogen gas. David Teitelbaum vin 10757 --- In dmcnews@xxxx, theshovel1224@xxxx wrote: > Had my battery on the charger for about 8 hours today. When I > took it off the charger, I heard a bubbling sound coming from > the inside of the battery. Just wondering, does a charging battery > normally make a bubbling sound after awhile? > > John Yeoman