Draper 12V Smart Charger and Battery Maintainer, 4A  £41.13

This portable 4A smart charger does more than just charge 12V vehicle batteries. It has the ability to activate, analyse and recondition the battery in 10-steps, making it ideal for deep discharged batteries. The charger can be connected to a Lead-Acid or Lithium battery for a long duration without the risk of overcharging. It can also be used in winter temperatures as low as -20°C. It's easy to use and a cost-effective solution to keep batteries in good condition all year round.