[Tuerkay]

Hey All,

since there is more activity in the F30 section than the F20 and both cars are kinda similar, i hope someone here can help me.

While my F20 pre-LCI (2012) is working (mostly) without issues, i realized that my battery only charges to around 60% for the last few months. Car has an IBS sensor and therefore should normaly keep the battery at around 80%, which it did until September. since then, checking my history i saw that it kept charging less from time to time and for the last month it wouldn´t go higher than 65%.
the battery (Exide EK800) is only 2 years old, so i don´t really think that it´s about to die. new battery was registered with ISTA when i changed it and ISTA also showed the milage of that exchange. If i check ISTA now, it shows that no battery change was registered ever...

could it be that now, since no exchange is registered, that FEM thinks the battery is to old and therefore doesn´t charge it properly?

when i use my car, i normally drive around 100km that day. before i was driving less and the battery still charged to 80%.

hope someone can help

[Billfitz]

If it wasn't registered when installed the car would have been overcharging it, as it increases the charge as the battery ages. It could be a defective battery. What is the warranty period?

[Tuerkay]

defective battery might indeed be possible.
once the battery voltage dropped to 5V after not using the car for 3 days. i recharged the battery and did an leakage test but couldn´t find any issues.
the alternator was checked around august this year, after my car started making squeaking noises on every cold start.
i bought the battery on mai 2019 and i think the seller told me it has 2 years warranty. the exide homepage however write 3 years, so i´ll check that tomorrow.

edit: contacted the seller. 2 Years Warranty (+1-2 Month good will). In my case i´m out of luck. Gonna try recharging the battery and watch it.