DRR Pro
| Michael, battery industry engineers recommend keeping batteries fully charged as often as possible. Some examples: *After a race day, fully charge the race car battery as soon as possible. Then, attach a maintainer until the next race outing. *The recommendation is the same for deep-cycle designs.
Larry Woodfin
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| | | Posts: 2097 | Location: Longview TX | Registered: March 12, 2004 | 
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DRR S/Pro
| I put my car in the trailer on Nov 15, 2025 and just got the trailer out of the garage and car out of the trailer today in 30* weather. This battery has sat unattended for 4 months. Odyssey says battery does not need charging if over 12.70v. mem…. i never charge battery at track….NEVER!!!  |
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DRR Trophy
| Seems like a good time to ask a question I've been thinking about. What's the least battery voltage before it starts causing issues? I measure my voltage after every run, before hooking up the charger. Also prior to firing up to head to the lanes. So far, the lowest I can recall is close to 12 flat. I keep it on a battery tender at all times when not at the track. When I remove the tender, it typically shows as high as 13.2vdc. When I get to the track it's settled to around 12.8vdc. After 1st pass I'm down to around 12.3vdc. Charging between rounds gets me close to where I started, but never fully charged. So far the lowest I recall it going after a pass is 12.05vdc. It's an older Optima red top. I always bring a spare out of one of my trucks at home, just in case. I don't run an alternator and car isn't loaded with electronics. Just the MSD ignition, water pump, fan which doesn't get much run time, fuel pump and of course the starter, which I hit maybe 3-4 times from leaving the trailer to pulling into the water box. Thanks...
William Kilduff
1970 Barracuda
1968 Camaro X2
1968 Caprice
1964 F100
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| | | Posts: 316 | Location: Wilmington NC | Registered: June 15, 2014 |
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DRR S/Pro
| quote: Originally posted by BTR69:
Seems like a good time to ask a question I've been thinking about. What's the least battery voltage before it starts causing issues? I measure my voltage after every run, before hooking up the charger. Also prior to firing up to head to the lanes. So far, the lowest I can recall is close to 12 flat. I keep it on a battery tender at all times when not at the track. When I remove the tender, it typically shows as high as 13.2vdc. When I get to the track it's settled to around 12.8vdc. After 1st pass I'm down to around 12.3vdc. Charging between rounds gets me close to where I started, but never fully charged. So far the lowest I recall it going after a pass is 12.05vdc. It's an older Optima red top. I always bring a spare out of one of my trucks at home, just in case. I don't run an alternator and car isn't loaded with electronics. Just the MSD ignition, water pump, fan which doesn't get much run time, fuel pump and of course the starter, which I hit maybe 3-4 times from leaving the trailer to pulling into the water box. Thanks...
William, I don't remember seeing less than 12.6 on mine after a run. I have a small digital gauge right above my charging lugs that I can look at when I walk by on the outside of the car. I do run an alternator though. |
| | | Posts: 3663 | Location: KIEFER, OK. | Registered: August 17, 2007 |
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