Two-slot lithium battery charger 4.2V with independent microcomputer management for 18650 cells

This two-slot lithium battery charger provides a practical solution for recharging multiple cylindrical cells safely at home or in the workshop. Its independent charging channels, each with a dedicated microcomputer management system, let you handle different battery types simultaneously without the risk of cross-charging. The charger works with a wide variety of popular cell sizes, from the common 18650 down to the compact 10440. Whether you need to keep spare batteries for torches, vaping devices, or portable electronics, this charger simplifies the process with automatic detection and clear visual feedback. The unit is compact at just 112mm x 60mm x 30mm, so it fits easily on a desk or shelf.

Features and Construction

This charger is built around a microcomputer management system that monitors each slot independently. The housing is made from ABS plastic, offering basic protection for the internal electronics. The front panel includes an LED display that shows charging progress and battery type, making it straightforward to see the status at a glance.

Charging Specifications

Input power is supplied via a Micro USB DC 5V port, with a recommended adapter current of 2A. The charger offers two selectable charging currents: 500mA and 1000mA. It uses constant voltage charging with a cut-off current below 100mA. Output voltages are 4.2V ±0.05V, 3.65V ±0.05V, and 4.35V ±0.05V depending on battery chemistry. The unit also includes a standard 5V/1000mA USB output port for charging other devices.

Compatible Batteries

This charger supports a broad range of cylindrical lithium-ion and IMR cells, including models 18650, 18490, 18350, 17670, 17500, 16340 (RCR123), 14500, and 10440. It also charges NiMH/NiCd and LiFePO4 batteries. The charger automatically identifies Li-ion and Ni-MH batteries, while LiFePO4 and 3.85V Li-ion require manual selection via the controls.

Protection Systems

Built-in safety features include over-charge protection, over-discharge protection, short circuit protection, intelligent identification of bad batteries, and reverse battery detection. The charger also has a 0V voltage activation function, though batteries with a voltage between 1.65V and 1.85V cannot be charged and will only receive a trickle charging activation current.

Uses and Placement

This charger is designed for indoor use only. It works best in a home workshop, electronics bench, or dedicated charging area where the unit can be placed on a flat, stable surface away from moisture. The compact size makes it easy to store when not in use.

Battery Maintenance

Regular charging with this unit helps maintain the usable life of rechargeable lithium-ion cells. The independent slot management means you can charge batteries with different charge levels or chemistries at the same time, reducing waiting time. The LED indicator shows each slot's progress from 25% to 100%.

Professional Workshop Use

For technicians or hobbyists who regularly use multiple cylindrical cells, this charger offers reliable performance with clear status feedback. The selectable charging current allows adjustment based on battery specifications, and the USB output can power small devices during charging sessions.

Benefits and Buying Value

This charger delivers consistent, controlled charging for a wide range of lithium-ion and NiMH batteries. Its independent slot operation and microcomputer management provide practical advantages over simpler single-channel chargers, especially for users who need to recharge multiple cells regularly.

Low Maintenance Operation

The automatic battery detection and protection systems reduce the need for constant monitoring. The LED display gives clear information on charging status and battery type, so you can quickly check progress without interrupting the charging cycle. The USB output adds extra convenience for charging small devices.

Why Choose This Product

If you need a charger that works with multiple cylindrical battery sizes, offers selectable charging rates, and includes comprehensive safety protections, this model provides a practical all-in-one solution. The independent slots make it especially useful for households or workshops with several battery-powered devices that use different cell types.