because it was kept charging thus reducing the battery lifespan. it is not like smartphone like you use it when it was not charging.
car should be install with intelligent circuit where it shouldn't be charge the battery all the time when the engine is running, but i guess it will be very expensive/complicated to do so.

Mine lasted 5 yrs.

1. Heat kills battery
2. Drive very short distance " daily ", thus not enough time to recharge
3. Did not maintain the battery water level.

I have seen some guy went till the max of preserving the battery by relocating it to the trunk/spare tyre storage.

Personally....if you had time. get a battery charger kit and do charge it frequently, it should extend its life

Minimum speed limit?? Ada ka such thing in msia?? Indon i know they hv.
Try this though, before you fire up the engine everyday, turn off all electronics first including air cond, auto headlamp , welcome lights and car audio.
I even hv a habit of switching off my air cond 200m before reaching my home and turn off engine.
So far my MF batteries can last me 4 years.Jap engine.

Why not you try getting a BMW to see if the battery can last longer

\why not get a new one? ITs 5 years warranty with service. All you need is to pay for the installments.

Trouble free.