Battery charger GP B441 for NiMH AA and AAA rechargeable cells, portable USB-powered charger

GP B441 is a compact, USB-powered charger designed to charge NiMH AA (Mignon) and AAA (Micro) rechargeable cells. The unit accepts both AA and AAA sizes and is intended for everyday maintenance of rechargeable batteries used in household electronics, toys, remotes and portable devices. Its portable form factor and USB power input make it compatible with power banks, USB chargers and computer USB ports for convenient charging at home or on the go.

Advantages

The charger provides safe charging for NiMH cells by incorporating automatic detection of cell size and charging current appropriate for AA and AAA batteries. Built-in protection prevents overcharging and minimizes the risk of overheating during charging. The USB power input offers broad compatibility with common USB power sources, and the compact, lightweight design supports easy storage and transport. The device is suitable for maintaining battery health through regular, controlled charging cycles.

Suitable for

• Charging NiMH AA (Mignon) rechargeable batteries
• Charging NiMH AAA (Micro) rechargeable batteries
• Use with power banks, USB adapters or computer USB ports
• Home battery maintenance and travel use

Key specifications

• Supported cell chemistries: NiMH
• Supported cell sizes: AA and AAA
• Power input: USB (5 V nominal)
• Form factor: compact, portable charger
• Protection features: overcharge protection and thermal monitoring

How to use

Insert AA or AAA NiMH cells into the charger compartments observing correct polarity. Connect the charger to a USB power source such as a power bank, USB wall adapter or computer USB port using an appropriate USB cable. The charger will automatically apply the correct charging current for the cell size. Monitor the charger during the first uses to become familiar with indicator behavior and charging duration for your batteries. After charging completes, disconnect the USB power and remove the cells for storage or immediate use.

Recommendations

Charge only NiMH AA and AAA rechargeable cells and avoid mixing old and new batteries in the same charging cycle. Use a stable USB power source that provides sufficient current and avoid leaving batteries in the charger for extended periods after charge completion.