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The toothbrush charger works. I have a 2001 E39 that the spare key (looks the same as the Z4) wouldn't remotely lock/unlock the vehicle. After 24 hours on the toothbrush charger, it started working again. Batteries do completely die, so in that case, a new battery will be required. Replacement is not trivial, requires some cutting/soldering/gluing, but not too bad, cost about $8 for a new batt.
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