I have a Oct 09 35d sport inovations first reg Mar 2010. Had a small waco compressor fridge running (auto cut of for low voltage) After a year started to get the high battery discarge, read the forums so used a fully auto ctec charger 2 twice a week for another six months. For some weeks the car may only travel 3 km in a day then will travel 300km. Discussed with dealer and realised they don't really know the problem with this and blame the fridge. Solution replaced the BMW battery with a century battery $200.00 took out the plastic compartment over the battery, lots of room there, inslalled a solinoid and second deep cycle battery inc cables etc and battery $300.00 also switch to enable both batteries if required (2nd batter becomes a booster battery for the start) Fridge now has 24/7 power feed. Never had re setting of computer or whatever they do with change of battery. Voltage test when engine running has always show 14.5 volts even after short or long running. Vehicle serviced by dealer and no comment made about extra battery. No problems since, have cold drinks during our hot summer when doing trips regularly (have covered 73,000 km) and haven't had to mess about with the dealer and never had to use the 2nd battery as a booster yet and no high discharge warning..............