HZ801721 3.7V 220mAh Lithium Polymer Pouch Battery For Small Smart Electronic Devices This compact lithium polymer battery delivers stable 3.7V power for compact consumer electronics. It fits space-limited hardware and supports custom tweaks for your project. Reliable pouch-cell performance keeps your small devices running steadily. Specifications Item Details Model Number HZ801721 Cell Type Lithium polymer battery Dimension 8.0±0.2*17±0.5*21±2.5 mm (Thickness*Width*Length)