Browse NEW or USED cars for sale on driving.co.uk We tested the new Halfords 2.4W Solar Battery Maintainer on a 2-litre petrol car that will, fairly reliably, drain its battery to the point that it ...

Although charging a car battery while still connected or in situ is possible, various industry figures (like Halfords) suggest it's always a ... trickle charging a battery would invalidate a warranty ...