@seven: if no success, it's very likely you have a bad solder joint. I have a tutorial somewhere how to measure the voltage on the battery with two pins poked in exactly the right place. It can help diagnose the problem. Both of my keys needed solder reflow and it brought them both back to life. Apparently they can handle only so many hundred drops in 17 years. I replaced one of the batteries but it probably didn't even need it these cells are amazing what other rechargeable cell can last two decades.


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)