Alcatel A30 Tablet Compatible Battery TLp040J1 3.85V 4000mAh

Alcatel A30 Tablet — 3.85V Li-Polymer Replacement Battery (TLp040J1)

This 3.85V, 4000mAh Li-Polymer cell replaces the original battery in the Alcatel A30 Tablet, A30 Tablet 4G LTE, and models 9024W and 8082. It matches the OEM voltage and physical footprint at 117.15 × 92.62 × 2.36mm. Swap it in when the original cell degrades and the tablet can no longer hold a charge through a normal day of use.

• A30 Tablet platform compatibility: The A30 Tablet series — including 4G LTE variants — shares the same battery bay dimensions, connector orientation, and 3.85V charge curve. Any device in this line accepts this cell without modification to the connector or charge IC settings.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the A30 platform. The BMS accepted charge current without tripping, voltage held steady across display-on and WiFi-active loads, and the charge IC reported correct termination at 4.35V.
• Fuel gauge recalibration after installation: After fitting this battery, run the tablet down to automatic shutoff — do not force-stop it — then charge uninterrupted to 100%. This single cycle resets the fuel gauge IC against the new cell's actual capacity curve and clears the inaccurate percentage readings that appear right after a swap.

Alcatel A30 Tablet shutting down at 15–25% remaining

This happens when the fuel gauge IC is still calibrated to the old, degraded cell. It maps voltage to percentage based on the previous cell's discharge curve, which no longer matches the new cell. When display backlight and WiFi radio draw peak simultaneously, the voltage drops faster than the IC expects and it triggers a low-battery shutdown. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% corrects the curve — after that, shutdowns at 15–25% stop.

Fast charging not available after battery swap on the A30 Tablet

The A30 Tablet's charge IC negotiates charge rate during the first accepted charge cycle after a new cell is installed. Until that cycle completes, the system may default to standard 5V/1A input rather than the faster rate. Plug into the original Alcatel charger — not a generic USB hub — and let the tablet charge from zero to 100% without interruption. After that first complete cycle, fast charge negotiation resumes normally.