# Put an alt. in the FC, now battery keeps dying. **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [January 18, 2008, 10:20pm UTC](https://forums.speedlife.net/t/put-an-alt-in-the-fc-now-battery-keeps-dying/42098 "2008-01-18T22:20:38Z")\ **Posts on this page:** 1\ **Showing post:** 9
**Author:** ![91MR2](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/91mr2/32/7217_2.png) [@91MR2](https://forums.speedlife.net/u/91MR2)\ **Post date:** [January 18, 2008, 11:25pm UTC](https://forums.speedlife.net/t/put-an-alt-in-the-fc-now-battery-keeps-dying/42098/9 "2008-01-18T23:25:16Z")
> [@Jskrapper](#): > > Joe, don’t forget the reason you changed your alternator was because of an overcharge situation due to a faulty internal regulator. That overcharged the battery for some time and may have either boiled all of the acid out, or just plain killed a cell like said before. My guess is the acid is low therefore giving low voltage esp in the cold for an extended period. Generally speaking when a cell dies in a 12v battery, you lose 2 volts give or take which will also cause this problem, but usually it would be the second you shut off your car the battery is dead. > > The battery you have is a sealed maintenance free battery meaning there is no access to the cells to refill with distilled water or acid. I can’t remember, is it a NAPA battery? Skrapper it is a NAPA batt. Nitro, it dies after being OFF for several hours, when running it’s absolutely fine. --- _[View the full topic](https://forums.speedlife.net/t/put-an-alt-in-the-fc-now-battery-keeps-dying/42098)._