A compact rechargeable battery pack for portable Raspberry Pi projects. The 4,000mAh lithium-ion battery provides several hours of runtime in a pocket-friendly size, with a single 1A USB output. Tested to run a headless Raspberry Pi with WiFi adapter for approximately 7 hours. Key Features 4,000mAh Capacity – Compact power for portable projects 1A USB Output – Sufficient for Pi and basic accessories Pass-Through Charging – Charge while powering devices (with limitations) 4-LED Status Display – Check remaining charge at a glance Micro USB Charging – 1A input, cable included Compact Size – Pocket-friendly form factor Specifications Capacity – 4,000mAh lithium-ion Output – USB-A, 5V @ 1A Input – Micro USB, 5V @ 1A Dimensions – 48.6 × 89.7 × 21.4mm Weight – 126.7g Ideal For Portable Raspberry Pi Zero projects Wearable electronics Mobile computing setups Phone charging on the go Package Contents 1× 4,000mAh battery pack 1× Micro USB cable Note: Not suitable for tablets requiring 2A charging. Output may flicker when starting/stopping charging. Pack may sleep with very low current loads (