If your car battery will not hold a charge, it means the stored energy drains away too quickly or fails to recharge properly. This issue can leave you stranded, as the battery provides the power needed to start your car and run key electrical systems when the engine is off. A failing battery or charging fault should be checked as soon as possible.

What does it mean when a battery won’t hold charge?

A car battery that won’t hold charge is unable to store enough energy to start the car or keep electrical systems powered. Even after being recharged or jump-started, it quickly loses power again. This often indicates an ageing battery, charging system problem, or electrical drain.

Common causes of a battery not holding charge

• Old or worn-out battery (typically after 3–5 years of use)
• Faulty alternator not recharging the battery
• Loose or corroded battery terminals
• Damaged battery cables or poor connections
• Parasitic drain from electrical components staying on
• Extreme hot or cold weather reducing battery capacity

Why do you need to fix it quickly?

If your battery cannot hold charge, you risk being unable to start your car at all. Repeatedly jump-starting the car also strains the alternator and starter motor, leading to more expensive repairs. Fixing the issue early ensures reliable starting and prevents roadside breakdowns.

How do you know if your battery isn’t holding charge?

Typical symptoms include:

• Needing frequent jump-starts
• Battery goes flat overnight or after short trips
• Dim or flickering lights even after driving
• Dashboard battery or charging warning light illuminated

What happens during an assessment?

A mechanic will:

1. Test the battery’s voltage, cranking power and ability to hold charge
2. Check the alternator and charging system for faults
3. Inspect cables, terminals and grounds for corrosion or looseness
4. Look for parasitic drains that may be discharging the battery
5. Advise whether the battery needs replacing or if another component is the cause

How much does it cost to fix?

The cost depends on the cause. Replacing a standard car battery typically costs $180–$400, while fixing charging system faults such as a new alternator can range from $350–$1,100+. Minor connection or wiring repairs may be cheaper.

Is it unsafe to drive with a battery that won’t hold charge?

Yes. If the battery drains while driving, your vehicle may lose power to critical systems such as headlights, power steering, and engine control units. It’s best to have the problem diagnosed immediately to avoid breakdowns and safety risks.