took the 3 year old bmw battery out and put a bigger H8 battery (eliminator battery ) so hopefully when it gets to -25c or colder it will start this winter. alt volts 14.0 steady with radio on. the BMW batt I took out would be alright if it doesn`t go below -20c. but with the bigger battery I have an extra 300 cca, so that should help.

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2003 bmw x5 3.0i ,219000km build date 2003-08-18