a power bank 18650 battery pack cells, cylindrical lithium-ion battery common in electronic devices, li-on rechargeable batteries

18650 accumulator alkaline amper background bank batteries battery capacity cell cells charge charger common commonly computer concept current cylinder cylindrical device devices digital electric electricity electrode electronic electronics element energy flashlight galvanic green high ion liion lion lithium lithiumion pack portable power recharge rechargeable recharger recycle storage supply technology tools unit used vapor volt voltage