2 slot battery charger for AA/AAA/18650:

A 2-slot battery charger for AA, AAA, and 18650 batteries is a handy device for charging rechargeable batteries commonly used in various electronic devices. Here are some features you might expect from such a charger:

1. Universal Compatibility: The charger should support multiple battery types like AA, AAA, and 18650, which are commonly used in consumer electronics.
2. Independent Charging Slots: Each slot should be capable of charging batteries independently of each other. This allows you to charge batteries of different types and sizes simultaneously.
3. Multiple Charging Modes: It should offer different charging modes like trickle charge, fast charge, and trickle charge to suit different battery types and conditions.
4. Safety Features: The charger should have built-in safety features such as overcharge protection, short circuit protection, reverse polarity protection, and overheating protection to ensure safe charging.
5. LCD Display: An LCD display or LED indicators can show the charging status of each battery, including charge level and completion.
6. USB Input: Some chargers come with a USB input, allowing you to power them using a USB port on a computer or a USB wall adapter, which adds to its portability and convenience.
7. Compact Design: A compact and lightweight design makes the charger easy to carry and store, especially for travelers.
8. Trickle Charge Functionality: This feature ensures that batteries are not overcharged by switching to a trickle charge mode once they are fully charged.
9. Automated Cut-off: The charger should automatically stop charging once the batteries are fully charged to prevent overcharging, which can damage the batteries.
10. Rejuvenation Function: Some advanced chargers offer a battery rejuvenation function to help restore the capacity of old or over-discharged batteries.