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Vancouver Off-Topic / Current Events The off-topic forum for Vancouver, funnies, non-auto centered discussions, WORK SAFE. While the rules are more relaxed here, there are still rules. Please refer to sticky thread in this forum.

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Old 12-19-2011, 03:11 PM   #1
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Two battery in the Trunk, Which one to charge/jump?

Just wondering if any technician knows, if I have 2 battery in the trunk, one is a bigger normal automotive size battery, the other connected one is smaller that looks like a motorbike battery.

Anyone know which one I should jump or charge? The car is stuck inside a garage with a few other cars that needs jumping as well, so I can't bring it to the dealership without jump starting it. Car is a 2007 Azure.
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Old 12-19-2011, 03:14 PM   #2
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if the two batteries are connected in parallel (+ to +, - to -), then it doesnt matter which one you jump.
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Old 12-19-2011, 03:16 PM   #3
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Tow it on a flatbed?
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Old 12-19-2011, 04:16 PM   #4
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I heard cars have these things called "owners manuals"
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Old 12-19-2011, 07:09 PM   #5
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As above, if you want the 100% correct answer: owner's manual. You can probably even find it on google.

That said, generally: On most vehicles with the Batteries in the trunk, there is usually a + terminal in the engine bay that is directly connected to the main cranking battery in the trunk. Pop the hood and look for a Red plastic cap with a + on it. You can pop that, connect the + from a booster pack to it, and a - to any piece of metal on the engine block.
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Old 12-19-2011, 07:22 PM   #6
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if your gonna jump it...connect it to the same size voltage as the 'host'...
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Old 12-19-2011, 07:23 PM   #7
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Charge both batteries (one at a time) with a good charger (10A output or more, not some dinky trickle charger) for several hours each. For such an expensive car (Bentley) I wouldn't risk jump starting it unless you're 100% sure you're doing it right.

That or get it towed, though that might be difficult with dead batteries as you're going to have fun getting it out of Park or getting the steering to turn (if it's an electric lock).
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Old 12-19-2011, 08:20 PM   #8
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sorry i had to

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Old 12-20-2011, 12:44 AM   #9
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Quote:
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I heard cars have these things called "owners manuals"
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Obviously the car maker chose not to include one (we lost it )
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Old 12-20-2011, 02:17 PM   #10
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the left battery is the main one. i suggest, disconnect the battery from the car, and charge it with a 1-2amp trickle. then reconnect it when it is fully charged.
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Old 12-20-2011, 02:23 PM   #11
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the smaller one
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Old 12-20-2011, 10:41 PM   #12
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the left battery is the main one. i suggest, disconnect the battery from the car, and charge it with a 1-2amp trickle. then reconnect it when it is fully charged.
I tried that with a digital charger that starts with 2 amp, but it didn't work.

Anyhow, problem solved. New battery is on its way ! Thanks
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Old 12-20-2011, 10:52 PM   #13
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Car is a 2007 Azure.
2007 Bentley Azure?
BALLIN'

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Old 12-20-2011, 11:06 PM   #14
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smaller ones usually simply to crank

larger one powers all the electronics
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