4-Port 1S LiPo Battery Balance Charger, 5V USB, for RC Quadcopters

Small RC quadcopters and micro-drones typically run on single-cell (1S) 3.7V LiPo batteries, and keeping multiple spare packs charged and ready between flights is a genuinely common point of friction for pilots who want to fly more than once per charging session. This 4-port charger addresses that directly, charging up to four separate 1S batteries at the same time from a single 5V USB power source - a wall adapter, power bank, or computer USB port - rather than charging one pack at a time.

Each port delivers a regulated 4.2V output (plus or minus 5%) at 350 to 490mA current, matching the standard charge voltage and a reasonable charge rate for small 1S LiPo cells without overdriving them. Protection circuitry includes overcharge protection to stop each cell safely once it reaches full charge, reverse-polarity protection against a backwards-plugged battery, and over-temperature automatic current regulation that reduces charge current if the charger or battery runs hotter than expected during charging - a meaningful safety margin for a device charging multiple lithium batteries unattended.

The charger connects via a 35cm USB cable, giving reasonable placement flexibility from whatever USB power source is being used, and the unit itself is compact at under 40mm in its longest dimension, easy to toss in a flight bag alongside spare batteries and a quadcopter. Each of the four ports operates independently, so batteries at different charge states can be mixed and matched without one port's status affecting another.

Pilots flying micro-drones or small 1S-battery RC quadcopters who want to recharge multiple spare packs simultaneously between flights, rather than charging one battery at a time and waiting between flights, will find this 4-port charger a practical, genuinely time-saving accessory for keeping a fleet of small batteries topped up and ready.