The Ledlenser Flex10 is a rugged, water-resistant power bank that runs on two replaceable 21700 lithium-ion cells, both included. With the two 4500 mAh cells it holds a total of 9000 mAh, enough to top up a phone, GPS or rechargeable torch while camping or travelling. Ledlenser calls it six-in-one: it works as a power bank, a charger for 21700 batteries with charge indicator, a safe storage case for the cells, it has two separate displays to check each cell's capacity, double short-circuit protection and fast battery replacement. Because the cells can be swapped, you can carry spares or use them in other Ledlenser lights that take 21700 batteries. The housing is IP65 rated, measures 54 x 29 x 120 mm and weighs 235 g with batteries.