The SparkFun LiPo Charger Basic is stripped down of all features and just does one thing well - charge 3.7V LiPo cells at a rate of 500mA. It is designed to charge single-cell Li-Ion or Li-Polymer batteries.

TinyCharger is an ATtiny25/45/85-based, single-cell Li-ion battery charger with selectable charging current limit (100mA - 1000mA) and an OLED display for monitoring.

Low-power ESP32 audio/radio device with SA828 walkie-talkie module, MAX9814 microphone, PAM8403-driven GD14 bone-conduction output, and single-cell Li-ion charging, power-path, 3.3 V regulation, and battery monitoring.

BLE smart espresso scale with USB-C power, single-cell Li-ion battery charging, load-cell measurement, local data logging, and an integrated segment/display interface.

2-layer single-cell Li-ion robot controller with BU01 UWB module socket, ESP32 Wi-Fi uplink, dual motor driver, isolated 5 V boost rails, onboard charging, status LEDs, and sensor connectors.

Production-grade power management board with protected 9-18V barrel input, auxiliary USB-C 5V sink input, TPS5430 5V buck rail, BQ24074 single-cell Li-ion power-path charging, and MIC5504 3.3V battery-backed output.

Battery-powered ESP32-WROOM-32 design with MAX30102 PPG sensor, MCP73871 single-cell Li-ion charging and power-path management, 3.3V regulation, and two low-current output terminals.

Portable Raspberry Pi Pico and NEO-6M GPS tracker powered by a single-cell Li-ion battery, with USB-C charging input, CC resistors, and USB-line ESD protection. Designed to support about 65 mA active current and roughly 30 hours from a 2000 mAh cell, following the performance targets from the evaluation paper.

The HY2213 series, developed and manufactured by HYCON Technology Corp., presents a high-precision, energy-efficient battery charge balance integrated circuit (IC) specifically designed for single-cell lithium-ion or lithium-polymer batteries. This component encompasses a wide range of features tailored for multi-cell Li-ion rechargeable battery packs applications, including a high-precision voltage detection circuit capable of monitoring overcharge situations with a detection voltage range between 4.000V and 4.500V. Its unique design allows for delay times generated internally, eliminating the need for external capacitors and reducing the overall component count. Operating with a remarkably low consumption current in both operation (Typ. value 2.5uA, Max. value 3.5uA at VDD=3.9V) and standby modes (Max. value 0.5uA at VDD=2.7V), the HY2213 series is designed for energy-sensitive applications. It also offers versatility in operation temperature, ranging from -40℃ to +85℃, and comes in a compact SOT-23-6 package, making it suitable for space-constrained applications. The HY2213 series underscores HYCON Technology Corp.'s commitment to advancing battery management solutions by integrating overcharge detection and release, standby detection, and charge balance functionality into a single, efficient, and easy-to-use IC.