Introduction
Few things are more frustrating than a kids' electric ride on car that simply won't charge. Your child is ready to go, the car is plugged in — and nothing happens. Before you assume the worst, the good news is that the majority of charging problems have straightforward causes and can be fixed at home without specialist tools.
This guide walks you through every common reason a kids' ride on car battery won't charge, how to diagnose the issue step by step, and when it's time to replace a component. We've written it to be as practical and clear as possible, whether you're technically minded or not.
How the Charging System Works
Understanding the basics makes troubleshooting much easier. A typical kids' electric ride on car charging system has four key components:
- The charger — converts mains electricity to the correct voltage for the battery (usually 6V, 12V, or 24V)
- The charging port — the socket on the car where the charger plugs in
- The battery — a sealed lead-acid (SLA) or lithium battery that stores energy
- The wiring harness — the cables connecting everything together
A fault in any one of these components can prevent charging. The key is to isolate which one is the problem.
Step-by-Step Diagnosis
Step 1: Check the Obvious First
Before anything else, run through these quick checks:
- Is the charger fully plugged into the wall socket and switched on?
- Is the charger connector fully seated in the car's charging port?
- Is the wall socket working? (Test it with another device)
- Is there a power switch on the car? Some models must be switched off to charge correctly
- Is there a fuse on the car that may have blown?
These simple checks resolve a surprising number of reported charging faults.
Step 2: Inspect the Charger
The charger is the most common point of failure. Check for:
- Indicator light — most chargers have an LED that shows red or green when connected. No light at all usually means a dead charger
- Physical damage — inspect the cable along its full length for cuts, kinks, or fraying, especially near the plug ends
- Connector damage — look at the charging plug for bent pins or corrosion
- Correct voltage — check the label on the charger matches the battery voltage (e.g., a 12V charger on a 12V battery). Using the wrong charger can prevent charging or damage the battery
If you suspect the charger is faulty, the safest option is to replace it. Browse our range of replacement kids' electric car chargers to find the correct one for your model.
Step 3: Inspect the Charging Port
The charging port on the car can become damaged or corroded over time, especially if the car has been used outdoors. Look for:
- Bent or pushed-back pins inside the port
- Corrosion or discolouration (green or white residue)
- A loose or wobbly port that moves when you insert the charger
A damaged charging port will need to be replaced. This is usually a straightforward repair — the port is typically connected by two wires with simple connectors.
Step 4: Check the Battery
If the charger and port both appear fine, the battery itself may be the issue. Here's how to assess it:
Visual Inspection
- Open the battery compartment (usually under the seat or bonnet)
- Look for a swollen or bulging casing — this indicates a failed battery that must be replaced immediately
- Check for corrosion on the battery terminals (white or blue-green powder)
- Ensure the battery connector is fully plugged in — it can work loose over time
Voltage Test (with a multimeter)
If you have a multimeter, you can test the battery directly:
- Set the multimeter to DC voltage
- Touch the red probe to the positive terminal (+) and the black probe to the negative terminal (−)
- A healthy 12V battery should read between 12.0V and 12.8V when rested
- A reading below 10V usually means the battery is deeply discharged or dead
- A reading of 0V means the battery has completely failed
The Deep Discharge Problem
Sealed lead-acid batteries — the most common type in kids' ride on cars — are particularly vulnerable to deep discharge. If the battery is left completely flat for an extended period (for example, over winter storage), it can enter a state where a standard charger can no longer detect or charge it.
In this case, the battery is not necessarily dead — but it may need a specialist charger with a "recovery" or "desulphation" mode to bring it back. If recovery fails, the battery will need replacing.
You can find compatible replacement batteries in our kids' ride on car battery collection.
Step 5: Check the Wiring
If all components appear fine individually, the fault may be in the wiring between them. Look for:
- Loose or disconnected connectors inside the battery compartment
- Wires that have been pinched, chafed, or cut (common if the car has been used on rough terrain)
- A blown inline fuse — many ride on cars have a small fuse holder in the wiring loom near the battery
Replacing a blown fuse is a quick and inexpensive fix. Always replace with a fuse of the same amperage rating.
Common Scenarios and What They Mean
Charger light doesn't come on at all
Most likely a faulty charger or a problem with the wall socket. Test the socket first, then try a replacement charger.
Charger light comes on but battery doesn't charge
The charger is receiving power but can't charge the battery. This points to a deeply discharged or failed battery, a damaged charging port, or a wiring fault.
Battery charges but drains very quickly
The battery is accepting a charge but has lost capacity. This is a sign of an ageing battery that needs replacing. Most kids' ride on car batteries last 1–3 years depending on usage and storage habits.
Car works fine but won't charge overnight
Check that the car's power switch is in the correct position for charging. Some models require the switch to be off. Also check the charger indicator — if it shows green immediately, the battery may already be fully charged.
How to Extend Battery Life and Prevent Charging Problems
Prevention is always better than a repair. Follow these best practices to keep your battery in good condition:
- Charge after every use — don't leave the battery flat. Even a short ride should be followed by a top-up charge
- Don't overcharge — most chargers are automatic and will stop when full, but avoid leaving the car on charge for more than 18–24 hours continuously
- Store correctly over winter — if the car won't be used for more than a few weeks, charge the battery fully before storage and recharge it every 4–6 weeks to prevent deep discharge
- Keep it dry — avoid charging in damp conditions and keep the charging port covered when not in use
- Use the correct charger — always use the charger supplied with the car or a verified replacement with the correct voltage and connector type
When to Replace vs Repair
As a general rule:
- Replace the charger if it shows no indicator light, has visible cable damage, or is more than 2–3 years old and the car has stopped charging
- Replace the battery if it is swollen, reads below 10V, is more than 2 years old with heavy use, or drains within minutes of a full charge
- Repair the wiring or port if the charger and battery both test fine but charging still fails
Replacement parts are widely available. See our full range of ride on car batteries and chargers to find the right match for your car.
Frequently Asked Questions
How long should a kids' ride on car take to charge?
Most 12V ride on cars take between 6 and 8 hours for a full charge from flat. Always refer to your car's manual for the manufacturer's recommended charge time.
Can I use a different charger if I've lost the original?
Yes, but you must match the voltage exactly (6V, 12V, or 24V) and use a compatible connector type. Using the wrong voltage can damage the battery or create a safety hazard. Browse our replacement chargers to find a compatible option.
My battery is swollen — is it dangerous?
A swollen battery should be treated with caution. Stop using and charging the car immediately. Swelling indicates internal damage and the battery should be disposed of safely at a local recycling centre. Replace it with a new battery before using the car again.
Can a completely dead battery be recovered?
Sometimes. A deeply discharged lead-acid battery may be recoverable with a specialist charger that has a recovery or desulphation mode. However, if the battery has been flat for a long time or shows physical damage, replacement is the safer and more reliable option.
How do I know what battery my ride on car uses?
Check the label on the existing battery — it will show the voltage (V) and capacity (Ah). You can also check your car's manual or the product listing. Our battery collection includes options across all common voltages.
Summary
A kids' ride on car that won't charge is almost always fixable. Work through the diagnosis in order — charger, charging port, battery, wiring — and you'll identify the fault quickly. The most common culprits are a faulty charger or a battery that has been deeply discharged through improper storage.
If you need replacement parts, Electric Ride On Cars stocks a full range of ride on car batteries and chargers compatible with most popular models available in the UK.
