Hello, many always complain about the original equipment batteries (Exide) from BMW. I have installed mine now the 8th season (since 2007- in winter always expanded and 2-3 times unloaded and recharged). Yesterday it should now be the last ride of the season and…Instructions made only Klack :-(, instruments off and on again. So start auxiliary cables on my thickness 😉 and the mople started- after a ride of about 1 hour, well white on a valley road – and again just click- a The last times I had the effect that all the values of the on-board computer were gone when starting, but the starter still turned. Having arrived at home I removed the battery and noticed that the cable shoe of the Minusposl was not quite fixed- Battery pole under it also very dark- cleaned with sandpaper – tightened and- Moppel ran immediately:-), maybe next spring she will also participate. The workshop would have immediately replaced the battery with a new one! So the Exide batteries seem to be top and the charging system of the F800S as well.