Mobile battery replacement · Battery keeps going flat
Battery Keeps Going Flat in Shirley? Drain Testing & Battery Replacement
New battery still going flat in Shirley? That is a parasitic drain or charging fault, not a bad battery. Drain testing plus battery replacement on-site.
Buying a second battery for the same car in a year is the clearest sign the first one was never the problem. Something is either draining charge while the car sleeps, or failing to put it back while the car runs.
A cheap battery from a chain retailer in Shirley, fitted without OBD registration, will fail early on any car built after 2012. We fit tier-1 batteries and register them to your car properly.
The wrong battery in a stop-start car will show a warning light within days and drain itself trying to charge to spec. We fit the OEM chemistry every time.
How a drain is actually traced
- Circuits are isolated fuse by fuse to locate the offending module rather than guessing at the usual suspects.
- Quiescent draw is measured after the vehicle's modules have gone to sleep, which can take 20–40 minutes — measuring too early gives a false high reading.
- Tier-1 batteries only — Yuasa, Varta, Bosch, Exide — with a real 2–4 year warranty and traceable batch codes
- On a battery replacement the equipment is matched to the vehicle — cranking current, terminal layout and battery location all change the approach.
Drain faults found nearby
Recent job nearby: a car in Shirley on its third battery in two years. Drain measured at 480mA, traced to a boot latch microswitch keeping a module awake.
Recent job nearby: a vehicle off M42 J4/J5 flattening weekly. Alternator produced 13.1V under load — replaced the charging fault, kept the original battery.
How the visit runs
- 1
Vehicle lookup
By reg on the phone — we confirm the exact OEM battery spec before quoting.
- 2
How a drain is actually traced
Alternator output is checked under electrical load with headlights, blower and heated screen on, not just at idle.
- 3
Fixed all-in price
Battery, fitting, coding, recycling, warranty — one number on the phone.
- 4
Driveway fit
Memory saver in, old battery out, new one in and terminals torqued to spec.
Usage patterns that flatten good batteries
Cars left standing on 1930s semis for a week or more between uses are the other common case in B90.
Locally that means the streets between Shirley and Solihull, with access via M42 J4/J5 and A34 Stratford Road and a practical radius reaching Solihull (~2 mi) and Shirley (~2 mi).
Stop buying batteries. Find the drain.
Proper quiescent current testing in Shirley, with the offending circuit identified rather than guessed. We route in via M42 J4/J5, roughly 2 miles out from Solihull.
Where we test
As a neighbourhood of Solihull, Shirley is covered alongside its parent town, so a battery keeps going flat call from any of them routes to the same engineer.
Who this page is for
Low-mileage drivers whose cars sit for days between short journeys.
Domestically, 1930s semis and retail-park units dominate around here, which shapes how these jobs are accessed and worked.
Repeat flat battery questions
Q.Is a parasitic drain always an electrical fault?
No. Sometimes it is an aftermarket dashcam, tracker or alarm wired to a permanent live. Those are the easy wins and we find them first.
Q.How long does drain testing take?
Allow around an hour. Most of that is waiting for the vehicle's modules to sleep — rushing it produces a meaningless number.
Q.Could short journeys alone be the cause?
Yes, and it is more common than people expect. If that is what the readings show, the fix is a conditioning charge and a change in usage, not another battery.
Q.Do you cover Shirley and the B90 area for this?
Yes. Shirley is inside our routine coverage from Oldbury via M42 J4/J5, roughly 2 miles from Solihull. We cover it alongside Solihull and the surrounding streets.
Q.What do you do with my old battery?
It goes back to a licensed recycler. Around 99% of a lead-acid battery is recyclable. No landfill, and we don't charge for disposal.
Q.Will I lose my radio code and seat memory?
No — we use a 12V memory saver on the OBD port during the swap, so all adaptations and settings are preserved.
Why this is safe to book
- We will not sell a battery to a car whose battery is not the fault.
- Fixed prices agreed before dispatch — no callout fee just to open the bonnet in B90.
Related pages
- 24/7 Emergency Jumpstart — battery keeps going flat in Shirley
- Car Jumpstart — battery keeps going flat in Shirley
- Jump leads didn't work — battery replacement in Shirley
- Start-stop and AGM systems — battery replacement in Shirley
- Night and early hours — battery replacement in Shirley
- Battery keeps going flat in Solihull (~2 mi)
- Battery keeps going flat in Shirley (~2 mi)
- Battery keeps going flat in Olton (~2 mi)
- Battery keeps going flat across Solihull
- Battery Replacement in Shirley — main page
- All jumpstart services in Shirley
The short version
Repeat failures are solved with a meter, not a parts catalogue. Find the drain, fix the cause, and the next battery lasts its full life. Either way you get the readings, the reasoning and a working vehicle before we leave.
Stranded with a flat battery?
Call now or send a WhatsApp — we'll confirm your quote and dispatch the nearest engineer.