Charging guide
Charging AGM Batteries
AGM charging: use AGM mode, correct voltage limits, and why overcharging is harmful.
Charging AGM batteries
AGM batteries need a charger with an AGM mode or profile. The absorption voltage is typically 14.4V–14.8V for 12V; float is around 13.2V–13.8V. Using a standard lead-acid profile can undercharge or overcharge the battery and shorten its life. Most UK smart chargers now include AGM; select it before charging.
Do not use a high-rate charger beyond the battery’s specified maximum (often in the handbook). Leave the charger connected until it indicates full or maintain. AGM is common in Start/Stop vehicles; correct charging helps avoid premature failure and system warnings.
Related charging guides
Compatible battery types
Recommended chargers
Smart chargers and maintainers that work with car, van, motorcycle and leisure batteries. Check AGM/EFB compatibility for Start/Stop vehicles.
CTEK
CTEK MXS 5.0 Smart Charger
Advanced 8-step charging with automatic reconditioning for dead batteries. The gold standard for battery maintenance.
Best for:
- •Vehicles parked for weeks at a time
- •Maintaining battery during winter
- •Recovering deeply discharged batteries
Prices and availability vary by supplier. Always check compatibility with your battery type.
CTEK
CTEK CS ONE Battery Charger
Compact APTO adaptive charging for cars, motorcycles, leisure and marine. One-button operation, AGM/EFB compatible.
Best for:
- •Start/Stop and AGM batteries
- •Motorcycles and leisure batteries
- •Simple one-button charging
Check compatibility with your battery type (AGM/EFB/lead-acid).
NOCO
NOCO Genius 5 UK Smart Charger
6V/12V 5A smart charger with Force Mode for dead batteries and desulfation. Works with AGM, lithium and leisure.
Best for:
- •Recovering very flat or dead batteries
- •AGM, EFB and lithium batteries
- •Cars, bikes and caravans
Ensure correct voltage (6V/12V) and battery type setting.
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Next steps
Match your battery type and use case with our charger sizing guide. For product options see our best car battery chargers UK. If the battery is beyond charging, use our Battery Fitment Finder. Not sure what’s wrong? Run battery diagnostics, or browse our battery guides.