Mobile car jumpstart · Battery keeps going flat
Repeat Flat Batteries — Shirley car jumpstart & Diagnosis
Flat again in Shirley? We measure quiescent current and alternator output before selling anyone another battery. Mobile Car Jumpstart, 24/7.
A healthy vehicle should draw around 20–50 milliamps once everything has gone to sleep. A faulty module, an aftermarket alarm or a stuck relay can pull ten times that, which flattens a good battery in two or three days.
Around Shirley we jumpstart cars every day — from tiny Fiat 500s outside terraces on B90, up to big Range Rovers and BMW X5s with dual AGM setups.
Near Sears Retail Park, we regularly cover car parks, driveways, kerbsides and residents-permit streets across the B90 area.
How a drain is actually traced
- Alternator output is checked under electrical load with headlights, blower and heated screen on, not just at idle.
- Circuits are isolated fuse by fuse to locate the offending module rather than guessing at the usual suspects.
- Honest advice — if it's actually the starter motor, alternator or a parasitic drain, we tell you straight
- Every car jumpstart finishes with a charging-system reading, so the same fault does not reappear next week.
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
Describe the symptom
Click, silence, dashboard flicker, or engine turning slowly — each has a different likely cause.
- 2
Fixed price
Quoted on the call from your postcode and vehicle, no surprises on arrival.
- 3
How a drain is actually traced
Alternator output is checked under electrical load with headlights, blower and heated screen on, not just at idle.
- 4
Test then jump
We measure the battery before touching it, so we know if it's a jump or a replacement.
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).
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.
Local reference data — Shirley
- Reference point
- Sears Retail Park
- Local authority
- Solihull Metropolitan Borough Council
- Local commercial context
- aerospace and airport services
- Main routes
- M42 J4/J5 · A34 Stratford Road · A45
- Service covered here
- Car Jumpstart
- County
- West Midlands
Repeat flat battery questions
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.How long should I drive after a jumpstart?
Ideally 30–45 minutes of continuous driving, not stop-start town use. But if the battery is old and the alternator can't get it above 12.6V at rest, it'll go flat again in days.
Q.Do you work on hybrids and mild-hybrids?
Yes — a hybrid still has a 12V auxiliary battery that starts everything. Toyota, Lexus, Honda and MHEV Ford/Vauxhall are all fine.
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.
Related pages
- Battery Replacement — battery keeps going flat in Shirley
- Van Jumpstart — battery keeps going flat in Shirley
- Vehicle left standing — car jumpstart in Shirley
- Keyless entry and immobiliser issues — car jumpstart in Shirley
- Roadside emergency — car jumpstart 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
- Car Jumpstart in Shirley — main page
- All jumpstart services in Shirley
Flat again?
Third battery in two years is a diagnosis problem. We measure the draw and the charging output before anything is replaced. Ask for a car jumpstart and quote your postcode — B90 is a routine run for us.
The short version
A battery that keeps dying is telling you about the car, not about itself. Measure the sleep draw and the charging voltage in Shirley and the real fault usually appears within the hour. If you would rather plan it than react to it, a car jumpstart can be booked for a time that suits.
Stranded with a flat battery?
Call now or send a WhatsApp — we'll confirm your quote and dispatch the nearest engineer.