Battery expansion board for Power bank concept

Lithium battery expansion board a lithium battery expansion board is an accessory designed to provide safe and efficient charging and discharging capabilities for lithium-ion or lithium-polymer batteries in electronic projects. it allows users to integrate rechargeable lithium batteries into their designs, offering a stable power supply for various systems such as arduino, raspberry pi, robotics, and other portable applications.

this board typically includes protection circuits to prevent overcharging, over-discharging, and short circuits, ensuring the battery's safety and longevity. additionally, it can feature a built-in charging circuit, often with a micro-usb or usb-c interface, allowing easy connection to a power source for charging the battery. the board is designed for ease of integration and typically has voltage and current output options for powering devices or projects.

specifications of lithium battery expansion board battery compatibility -battery type: lithium-ion (li-ion) or lithium-polymer (li-po) -nominal voltage: 3.7v -maximum voltage: 4.2v (fully charged) -capacity range: typically 1000mah to 5000mah or higher -charging current: 500ma to 2a (depending on the board's design) protection features -overcharge protection: automatically stops charging when voltage exceeds safe limits (typically 4.2v) -over-discharge protection: prevents the battery from discharging below a safe voltage (typically 3.0v to 3.3v) -short circuit protection: detects and prevents damage from short circuits -temperature monitoring: some boards include thermal protection to monitor and prevent overheating -cell balancing (optional): some advanced boards offer balancing features for multi-cell batteries power supply & output -input voltage (charging): 5v (via micro-usb or usb-c) -output voltage: 5v (regulated) for powering devices -output current: typically up to 1a to 2a depending on the design -output type: 5v usb output or direct gpio pins for custom applications charging circuit -integrated charging ic: supports charging via usb (e.g., tp4056 or similar) -status indicators: charging and full-charge leds to indicate battery status -charging time: typically 2-4 hours depending on battery capacity and charging current physical dimensions -size: varies by board design, typically around 40mm × 60mm for compact designs -weight: ~10-30g depending on battery and protection circuits additional features -usb power output: some boards feature a usb port for powering external devices directly from the battery -on/off switch: some models include a power switch to control the board’s operation -stackable headers: some expansion boards are designed with headers for easy integration into development -charging and load port: many boards allow simultaneous charging and discharging (pass-through