This intelligent 4-slot battery charger is engineered to handle 18650, 14500, AA, AAA, and other rechargeable batteries with unmatched versatility. Each slot operates independently, allowing you to charge different battery types and sizes simultaneously without interference. The large LCD screen clearly displays real-time voltage, charging current, capacity, and percentage for each bay, so you always know the exact status of every cell. Equipped with smart microcontroller technology, the charger automatically detects the battery chemistry (Li-ion, Ni-MH, or Ni-Cd) and selects the optimal constant current – from 0.5A to 2.0A – to maximize lifespan and safety. Advanced protection circuits guard against overcharge, over-discharge, reverse polarity, short circuit, and overheating, with a built-in temperature sensor that reduces current when temperatures rise. The integrated USB output port lets you use a charged battery as a portable power bank to recharge your phone or other devices, making it an ideal travel companion. Whether you are a hobbyist, photographer, or daily user, this charger delivers reliable performance, fast charging speeds, and long-term durability, ensuring your batteries are always ready when you need them. Its compact design and universal input (100–240V AC) further enhance convenience for worldwide use.