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Join Date: Jun 2003
Location: Honeoye Falls, NY
Posts: 154
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Static Current draw on battery
Does 45 mA draw on the battery with the car shut down seem unusual?
It's a 2 yr old Optima Red top. I've been charging it every five days or so because the engine seems to crank slower each day. Checked the ground strap from frame to transmission. With engine running at 2000 rpm and lights on, voltage at terminals is arounf 14 V.
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Big Hooters and 911's will always be in style |
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04-30-2007, 04:58 AM
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Your charging voltage seems about right. 45ma means that it would pretty well drain your battery dry in 1,000 hours (40 days), assuming 45 amp-hour battery. I assume from your user-name that you have a 1990 or newer C2? Are you measuring the current draw with alarm on? I know they use some current (my 993 uses more power with alarm on). Your numbers don't seem really out of line.
I hope you don't need a new battery, but if you do, these are great: www.rockracingbattery.com Best I've ever used (but pricey). I use the 1236 in my 73RS racer and after 5 years it's better than any other new battery I've used. I might recommend a slightly larger model for a newer car with more electrical accessories though (1257)...
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2022 GT3 Manual, 73 Carrera RS 2.9 Twin-Plug MFI Carbon Fiber Replica Former: 18 GT3 Manual,16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, BMW 635CSi Euro, Ferrari 550 Maranello, 06 Evo IX w/ many mods |
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04-30-2007, 05:24 AM
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Join Date: Aug 2001
Location: midwest
Posts: 40,002
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Some questions about using16V batteries:
What damage would the higher 16V voltage do to stock CDI/coil systems? How could the voltage regulator (output: mid14Vs) recharge the battery? What would that do to 12V radios and alarms etc....? Are all the older, stock, wires rated for such? Please educate us on the conversion process. Thx. C2: Make sure the battery is disconnected from the chassis when charging so the charger doesn't spike the vehicle electronics/etc, and make sure it stays at ~12.6V a couple days later after the surface charge has been absorbed. Two years isn't much, but it may be time for a new battery.
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Meanwhile other things are still happening. |
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04-30-2007, 06:03 AM
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Join Date: Jun 2003
Location: Honeoye Falls, NY
Posts: 154
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It's on an 86 coupe. Not many bells and whistles. The C2 is a rowing ergometer.
One other detail. Early in the year I connected the battery charger backwards for an instant and there was some current, but it was not plugged in. Someone at work thinks I may have damaged a rectifier in the alternator.
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Big Hooters and 911's will always be in style |
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04-30-2007, 06:30 AM
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Quote:
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2022 GT3 Manual, 73 Carrera RS 2.9 Twin-Plug MFI Carbon Fiber Replica Former: 18 GT3 Manual,16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, BMW 635CSi Euro, Ferrari 550 Maranello, 06 Evo IX w/ many mods |
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04-30-2007, 07:22 AM
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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Re: Static Current draw on battery
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fwiw.. i finally bought a simple battery load tester. A bud said spend the $90 on a snap-on. I only used it once on my 911 but it told me exactly the % of max current available.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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04-30-2007, 07:31 AM
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Join Date: May 2002
Location: St Louis
Posts: 4,211
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Quote:
The worst thing that could have happened is the battery saw a large current spike. They do that all the time when you turn the key. My 88 draws 90 milli amps |
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04-30-2007, 07:31 AM
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1973 Porsche Carrera RS 2.7 Replica 2.7RS
