Lithium Jump Start Battery Pack

[SimonTheSailor]

Has anybody got/used one of these ? Seem like a good idea as they seem to keep their charge for ages and you can store in the glove box. You can also charge phones/laptops so many uses.

Any recommendations ?

[SimonTheSailor]

Ok, sound like a good idea then. Actually need it for a boat and to recharge stuff whilst onboard but will also come in handy for the car.