Founding Member #2
Join Date: Jun 2006
Location: Orange County, CA
Vehicle: 2008 SLK 55
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Would you happen to know how long my battery should normally take to charge?
It all depends on the state of the battery at the time you hook it up to the trickle charger.
I use the Battery Tender brand, which I think works the same way. With a reasonably functioning battery, it takes about 2 hours
for the trickle charger to give me a flashing green LED (indicating about 80% full); this is the rapid charge mode and the charger has now switched to trickle charge mode.
I usually connect the trickle charger at night on a weekend, at which time the green LED is flashing; by morning, the green LED is constantly lit, indicating a 100% charge and is on maintenance mode. This is prolly another 6-8 hours after reaching the 80% mark.
I did have one incident where I discharge the battery down to 11 volts, perhaps less (considered no power by the electronics in the car), and it took roughly 8 hours to get to the 80% mark and another 10 hours to reach the 100% mark.
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Pewter(cubanitsilber metallic)/Beige, PIII package, Airscarf, Hands-Free Communication System, Lighting package; Designo Black Leather Cover on e-brake handle(Thank you Bill T), SmartTop v3.x, John's 3BFM, M113 AMG OEM air filters, Modified R170 ant., clear side-markers & front parking lamps w/error-free LEDs, chromed front & rear turn indicator lamps, steel mesh at battery bay cover & cabin air intake, sock-over-seatbelt buckles, belt-loop guide protectors, Lamin-X fog lamp protectors, bilateral rear fog lamps enabled, AMG crest on gear shift knob