To jump-start a car we'd recommend any of the battery packs in our Top 10: kit.honestjohn.co.uk/top-tens/top-10-jump-starters/ The DB Power ones are very good for the money.

If you want to maintain and recondition a battery, the C-TEK MXS is a good battery charger that comes in a variety of options for different engines. Our C-TEK MXS 5.0 review is here: kit.honestjohn.co.uk/reviews/review-ctek-battery-c.../