Beetle BLE - The Smallest Arduino Bluetooth 4.0 DFRobot (BLE) - DFR0339

Features:

• Standard Raspberry Pi 40PIN GPIO extension header, compatible with Raspberry Pi series boards
• I2C bus communication for real-time monitoring of battery voltage, current, power, and remaining capacity
• Multi-battery protection circuits: overcharge/discharge protection, over current protection, short circuit protection, reverse protection, and equalizing charge
• Onboard 5V regulator, up to 2.5A continuous output current
• 5V USB output for powering additional boards
• Batteries warning indicators for easy connection verification

Specifications:

• Output voltage: 5V
• Charger: 8.4V 2A
• Control bus: I2C
• Battery supported: 18650 Li battery (NOT included)
• Dimensions: 56mm × 85mm
• Mounting hole: 3.0mm