Braxyn
A dead battery used to mean finding a stranger with jump leads and a running engine. This does it alone: 15,000 mAh turns over most 12 V cars, SUVs and motorcycles, and small diesels as well as petrol.
It doubles as a power bank over USB, and the built-in torch has strobe and SOS modes – which matters more than it sounds if the breakdown is at night on an unlit road. The body is IP67 rated against dust and water, and the smart circuitry protects against reverse polarity, short circuits, overcharging and overheating.
Enhanced chip technology keeps self-discharge low, so it is quoted at holding charge for around six months standing by. Top it up every few months anyway: a jump starter you find flat is no use at all.
