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The Key charger from Folomov is an example of a compact charger which can be compared to the size of a car key. The charger is compatible with Lithium ion batteries that have a voltage of 3.6V/3.7V. This includes the likes of 21700, 20700, 18650 batteries which have 2A output. The battery capacity of a battery can be checked by the Key charger without having to connect it with a power supply. The Key charger has another unique feature which includes the application of a power bank. This device is capable of charging other USB devices owing to it also being a power bank. The device has LED light indicators which notify you about the status of battery charging. The device is also has a number of different protections.