Scenario · Overnight
Car Battery Died Overnight?
Fine yesterday, dead this morning? We jumpstart on the spot and investigate parasitic draw before it happens again.
A fine-yesterday-dead-today battery is either at end-of-life (won't hold overnight rest voltage) or being drained by something on the car that's not switching off — a stuck relay, an aftermarket dash cam, a boot light, a faulty central locking module.
We jumpstart first, then check parasitic current draw so the same thing doesn't happen tomorrow morning.
What we actually see on these jobs
- A brand-new battery can go flat overnight if the drain is bad enough — replacing it without finding the drain is money wasted.
- Dash cams hard-wired to permanent live are the #1 aftermarket culprit we find.
- Comfort-access key fobs on some models hold modules awake for hours if the fob is close to the car.
Key facts — Overnight battery deaths
- Healthy rest voltage
- 12.55V minimum after 8 hours idle
- Typical parasitic draw
- <50mA. >100mA is a fault
- Common culprits
- Aftermarket dash cam, boot latch, stuck relay, comfort access
- What we do
- Jumpstart → load-test → parasitic draw check
From call to key-turn
- 1
Call
Talk to a real engineer, not a call centre. Fixed price on the phone.
- 2
Route
We tell you our ETA and route via the fastest corridor — no vague windows.
- 3
Test & fit
On your driveway, in a car park, at the roadside — same process, honest result.
- 4
Recycle & warranty
Old battery taken away, warranty registered, all in one visit.
Who calls us for this
Commuters running late, parents on the school run, and anyone who had a car working perfectly the night before.
Overnight battery deaths — specific questions
Q.Why did my battery go flat overnight when the car was fine yesterday?
Either the battery has failed a rest-voltage hold (end of life) or something on the car is drawing current with the ignition off. We check both.
Q.Can you find what's draining my battery?
Yes — we do a parasitic draw test with a clamp meter after the jumpstart. Anything above ~50mA gets investigated by pulling fuses one at a time.
Q.Is it the alternator?
It can be, but if the car ran fine all day yesterday and died overnight, it's very rarely the alternator — that would show as poor charging during driving, not overnight drain.
Related guides
General questions
Q.What warranty comes with a new battery?
Tier-1 batteries with 2–4 year warranty depending on chemistry (standard flooded, EFB or AGM). Warranty is transferable and registered on the day.
Q.How quickly can you get to me?
Typically 45–60 minutes across the West Midlands from our Oldbury base — faster off-peak and at night when the roads are empty.
Q.What payment methods do you accept?
Card, contactless, Apple Pay and Google Pay on the driveway. Bank transfer accepted for accounts. No cash-only surprises.
In short
'Fine yesterday, dead today' is a diagnostic job, not just a jumpstart job. We do both so you don't call us again next week.
Dead-in-the-morning battery? We'll fix it and find the cause.
Jumpstart, load test and parasitic draw check — one visit.
Stranded with a flat battery?
Call now or send a WhatsApp — we'll confirm your quote and dispatch the nearest engineer.