Kairos. I bought the BMW charger that plugs
in the cigarette lighter. It cost me $98 cdn.
I wouldn't use any other charger just in case
it damages the electronics of your car. The
package of the BMW charger states:
THE ADVANCED BATTERY CHARGING SYSTEM
IS A 1.25 AMP BATTERY CHARGER DESIGNED
TO FULLY CHARGE AND MAINTAIN A BATTERY
AT A PROPER VOLTAGE WITHOUT THE DAMAGING
EFFECTS CAUSED BY TRICKLE CHARGERS.
OUR NEW BTP MICRO-CHIP TECHNOLOGY APPLIES
THE CORRECT PEAK CHARGE, THEN AUTOMATICALLY
MAINTAINS THE BATTERY AT THE PERFECT FLOAT
VOLTAGE WHICH ELIMINATES SULFATION.

Moto