The BMW charger is a rebranded Deltran. I've had the BMW one for a year now and charge the car once a week in the winter when it is seldom used. Never had any issues.
It is easy to hook up and use. There is a red positive connection in the BMW's engine compartment and a negative post to connect the battery charger to. The BMW battery is an AGM type in the trunk so you should ensure that your battery charger is compatible ie it should be an electronic battery charger capable of figuring out what charge the battery is at and modify its charging accordingly.
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