Draper 12V Smart Charger and Battery Maintainer, 2A  £35.98

This portable 2A smart charger does more than just charge 12V vehicle batteries. The charger can be connected to a battery for a long duration and it will monitor the power and slow it down to prevent any overcharge. An LED light will flash at each stage of charging: 25%, 50%, 75%, and 100%. It is also suitable for winter charging in temperatures as low as -20°C. It is an easy to use and cost-effective solution to keep batteries in good condition all year round.