Universal Battery Charger: The 18650 battery holder can charge rechargeable batteries of different specifications simultaneously. Suitable for 3.7V Li-ion rechargeable batteries - 18650 26650 14500 16340. Not suitable for Ni-Ni-Cd AA AAA AAA C batteries. Powerful Charger: When using a 3.7V battery charger, it reaches a maximum charging current of 1A. Truly intelligent battery charger for you. Safe Charging Protection: The battery charger has microcomputer control technology, built-in intelligent circuit protection could effectively prevent overcharge, overdischarge, overcurrent, overvoltage, overheating, short circuit and reverse polarity conditions of the battery to protect the battery. Safety Charged Charge Anywhere Anytime: The 18650 battery charger with Type-C input port, especially when you don't have enough outlet, you can use 5V/2A power bank, adapter, laptop, car charger, cell phone charger, USB wall charger, etc. to charge the battery. Portable size charging set easy to carry