I use my key daily and it holds a charge okay. My husband never drives so his never seems to be charged and work right. We try and remember to use his every once in a while. Good to know the replacement key cost. I have seen it as high as $250 US. OUCH!!

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Tracy
2005 Imola Red X5 4.4
1995 Daytona Violet M3
"Girls Go Fast Too"