Flat car battery — how to tell it's getting weak
A weak battery usually shows gradually: the car starts harder on cold mornings and cranks slower, but after a drive everything seems fine. If the battery goes flat repeatedly, the battery may not be the only cause.
Possible causes
- Battery age and wear
- Short trips that don't recharge the battery
- Alternator not charging enough
- Something draining current while parked
- Hard frost reducing battery capacity
What you can safely check yourself
- Whether the car failed to start after standing for a while or a frosty night
- Whether the battery warning light comes on while driving
- Whether anything was left on — lights, a charger, interior lights
When to call a mechanic
If the battery keeps going flat, recharging it isn't enough — the charging system and any current drain need checking.
How MobilaisServiss can help
We test the battery, measure the alternator charging voltage and replace the battery on site if needed.
This is a general guide, not a diagnosis. The exact cause can only be confirmed after inspecting the car.