BenzWorld Junior Member
Date registered: Dec 2011
Vehicle: 1993 300SL
Location: San Francisco Bay Area
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Battery charging... the details (R129, CTEK 7002)
Have the usual situation with a classic ('92 300SL) that doesn't get driven much. Bought a http://www.amazon.com/CTEK-Multi-7002-Battery-Charger/dp/B000FRLO9Y, which seems to work nicely.
The 100 Ah Made-in-Spain battery is in the right side of the trunk. I hooked up the "permanent" fittings to the + and - terminals with the idea of plugging in the charger and leaving it, maybe for months at a time.
1. With this type of charger (which isn't overdriving voltage and boiling the battery), do I need to loosen the battery caps? I've always done this (40+ years) whenever hooking up any charger, even though my brain says batteries must be able to vent themselves.
2. To confirm, the reason why one always hooks up the negative "jumper" away from the battery is to avoid sparks. Since the charger is unplugged (and on the garage floor) when 0I'm hooking up the charger connector to the permanently installed battery jumpers, this is no problem, right?
3. Do I need to have the trunk propped open for ventilation when the charger is just doing normal maintenance charging? Again, it seems like Mercedes didn't worry about this since the trunk is closed when the car is being driven and charged, but there's probably more ventilation in the trunk in motion than just sitting in the garage.
Thanks for any reasoned advice. Happy New Year.