Since I changed my work, I do not drive my 2001 X5 every day (once/3-4 days), the battery died. I replaced the original battery. 2 months later, the new battery died. Then I got my third battery, it then died in 1 month. What appears to me is the following:

1. The brand new battery is fully charged, and it takes a while to drain all the charge. So the first dying event occurs after 1 month.
2. Since I do not drive much, even once 3-4 days, the battery can not be charged to full each time after driving. It dies more frequently.
3. I measured the battery current drain (with all interior lights off and engine shut off). First minute turning off the engine, it is ~2 Amps. After 1 minute and on, it is 1.2 Amps. At 1.2 A of standby current, it may be too much for the battery.

My question is that anyone knows is 1.2A current too much as standby current? Is the new battery permanently damaged when charge is completely drained?

Thanks, //leo