Lenovo ET280 Compatible Battery 3.7V 2600mAh Li-ion

Lenovo ET280 — 3.7V Li-ion Replacement Battery (GB/T18287-2000)

This 3.7V, 2600mAh Li-ion battery replaces the original cell in the Lenovo ET280 PDA. It fits the ET280 handheld directly, restoring power to a device that has lost runtime to cell degradation. Voltage and capacity match the original specification exactly.

• ET280 platform fit: The ET280 runs a single-cell 3.7V Li-ion architecture. The BMS in the device communicates with the battery over the connector to manage charge cutoff and low-voltage protection. This cell meets that voltage rail and connector spec, so the handshake completes correctly.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the ET280 platform. The BMS accepted the battery without fault codes, charge termination triggered cleanly at 4.2V, and the low-voltage cutoff fired at the expected threshold before cell damage could occur.
• Pre-swap sync on the ET280: The ET280 holds open application state and unsaved data in volatile RAM powered directly by the main battery. Before removing the old cell, perform a full ActiveSync or data sync to the host computer. Any file left open in RAM will be gone the moment battery voltage drops to zero.

ET280 not booting after new battery installation

A freshly installed Li-ion cell often ships at a storage charge of around 3.0–3.3V. The ET280 boot sequence requires a minimum voltage to initialise the processor and load the OS from flash. If the device shows nothing on screen or immediately powers off, the cell voltage is too low to complete the boot. Connect the ET280 to its charger for at least 30 minutes before attempting the first power-on — the charge cycle will bring the cell above the boot threshold, typically 3.6V.

Battery life noticeably shorter during barcode scanning or wireless sync

The ET280's scanner LED and wireless radio draw significantly more current than standby or basic data entry. At a 3.7V nominal cell, a burst scan or active Wi-Fi or Bluetooth session can pull several hundred milliamps — well above the background load the device sees when idle. This spike causes visible voltage sag, which the BMS can read as a low-battery condition even when the cell still holds substantial charge. If life feels short in active scanning use, let the device run a full discharge-and-charge cycle to recalibrate the fuel gauge to the actual 2600mAh capacity of this cell.