redyoonnk1

I started my car one day in the afternoon and had a extremely slow crank and would crank less and less every subsequent try. I tested the battery and it only had 11.5 volts. I barely drive the car, so I'm thinking that's why the voltage got so low. I then brought the battery to a Firestone and they charged the battery and it tested in good condition.

So I checked the charge of the battery after i got it back and it was 12.74 volts, but overnight it dropped to 12.52 volts WITHOUT it being connected to anything. Is it normal for a battery to drop like that? I've only had battery for 8 months.

Chuck S

The battery may have been damaged by discharging it too deeply. When in the car it's always being discharged by little currents like the remote locks, radio memory, etc. Tiny currents will add up over several days (or weeks).



If you're not driving the car you should either connect a battery tender or just disconnect the battery. I use this switch with my Fords when I park at the airport for more than a weekend. The S2000 has been on a battery tender in my garage since November. Starts instantly every month.



-- Chuck

redyoonnk1

Do you have a link where i can purchase one? thanks

Vanishing Point

The Battery Tender Junior 12V is what you want, also look for it on Amazon as they frequently have them cheaper. I have several and they work flawlessly.

http://www.batterytender.com/Automotive/

zeroptzero

Batteries have a resting voltage after full charge. So you can charge them fully to say to high 12's, and then they can drop a 1/4 of a volt quickly without anything being connected to them. That is just the resting voltage. Now if it keeps dropping steadily and quickly after that then you may have an issue. Batteries will also drop voltage while in storage, but at a low rate, maybe .05-.10 volts every month give or take ?

starchland

Never let the battery run down. It will never be able to go back to its full potential after