POWER BANK CN-5V-5800mAh New – practically used once. Consists of four Li-ion 18650 3.7V 2200mAh cells, total energy capacity 32Wh. Two USB-A outputs and one USB Type-C provide fast phone charging. Recharge the power bank with a standard 5V 2A charger via Micro-USB. Charging cables included. Housing opens. Batteries can be replaced. Charging cycles: 1000x. Read more online – Everything about and around 18650 Li-ion batteries. How to extend battery life: • Avoid full discharge: Lithium-ion batteries prefer to be charged more often (for example, when 20–40% remains) rather than being drained to zero every time. • Avoid heat: High temperature is the main cause of lithium battery “death”. • Storage: If the battery is not used, it should be stored partially charged (about 50–60%) in a cool place.