WINTER will expose weakness in any battery. The cold weather slows down the chemical reactions inside the cells, while your car will demand more power to start the engine and demist the windows.
If you are only doing short journeys or not using the car often, the battery might not have a chance to be recharged by the engine, and eventually you’ll need a top-up or a jump start – usually at the most inconvenient time.
In previous tests we found some solar chargers were barely worth the effort, but the technology is improving all the time, and prices are coming down.
So, which of the