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-I've had to jump mine, a couple times, way back in the car's youth;
both times it was done through the front under hood connections
with no problems. (That orig battery went on to live for 6+years and
59,000 miles, too.)
-Any good low amp trickle charger can/should be connected to the
front under hood connections, imo. The fancy BMW one and, some
Battery Tender versions, come with a plug for the cig lighter which
should alleviate having to use those front connections and certainly
not have to connect to battery in rear of car.
-I've never disconnected my X or Vette or motorcycles' batteries
when using my Battery Tender trickle charger...must be a UK thing.
-I left my X on the trickle charger via an appliance timer, for weekly
charging, in my unattended garage for 5 months and it worked like
a charm.
Yes, weird stuff can happen; save me the lectures...I've never had
a problem in low amp/sustained float/short, medium or, long term
charging.
GL,mD
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