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Most batteries will come back to life after a deep discharge and a slow recharge. The dealer has jumped started it already other wise they could not have tested the alt's out put as it needs to spin (ya think?). On the drive home the Alt will be charging at 100% to recharge the battery. 24 hrs on a slow 2-5 amp battery charger should bring the battery to full charge. If your not planning to driver her every day I would leave it on a trickle charger for an additional 24 just to make sure.
Quick test after charging to confirm the battery ability is to load test it for 15 secs with 150 amp draw (actually it should be the battery's 1/2 cold cranking amps rating but you will need one of these to do that) to pull away any "surface charge" and then wait a few mins and test with a volt meter.
The poor man's load test is simple, key on, accessories all on, headlamps, blower on high, radio, etc (don't forget the rear window defroster). Leave on for 20/30 seconds and then wait 15 seconds and test battery voltage. See Chart for actual battery state of charge.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Last edited by StephenVA; 07-25-2016 at 12:57 PM.
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