Thread: X2 M35i Battery
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      09-08-2020, 02:40 PM   #33
bimmerdriver2
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Drives: 2020 M2C DCT
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Location: Vancouver, BC, Canada

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I periodically put my X2 on a charger. It typically takes several hours to fully charge the battery, even if the car has just been driven, which demonstrates the downside of BMW's pursuit of fuel economy at all cost. Often when I initially connect the charger, the current draw can be 15 A or more for a few minutes.

I use a HP 6033A laboratory power supply to charge my cars. It's not suitable for unattended charging, but gives direct control and visibility of the charging voltage and current. I charge at 14.4 V until the charging current is 1% of the Ah rating, which is fairly widely used in the battery industry. After charging, I let the battery float at 13.6 V for several more hours, unless I need to drive the car.
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