Zebra ET50 Replacement Battery 3.8V 8600mAh AMME2415

Zebra ET50 / ET55 — 3.8V Li-Polymer Replacement Battery (AMME2415)

This 3.8V, 8600mAh Li-Polymer battery replaces the AMME2415 / BTRY-ET5X-8IN1-01 in the Zebra ET50 and ET55 enterprise tablets. These are rugged 8-inch Android tablets used in warehousing, logistics, and field operations. When the original cell degrades, scan response slows and the tablet drops off-shift before the operator does.

• ET50 and ET55 compatibility: Both tablets share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why a single cell covers both. The 8-inch variant of the ET5X series draws from the same 3.8V rail regardless of the Android OS version running on the unit.
• Bench tested on actual hardware: We cycled this cell on an ET50 under combined WiFi and barcode-scan load. The BMS held the charge curve without tripping at motor-start equivalent draw peaks, and capacity readout stabilised after one full recalibration cycle.
• Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff under normal workload, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell and clears the inaccurate percentage display that appears immediately after a swap.

Zebra ET50 shutting down at 15–25% after a battery swap

The ET50 shuts down early because the fuel gauge IC is still calibrated to the resistance profile of the old, degraded cell. When the new cell hits the same voltage point the old cell did at 15–25%, the OS interprets it as critically low. Under combined display and WiFi load, the voltage sag is enough to trigger an immediate shutdown even though real capacity remains. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets this. After that cycle, the shutdowns stop and percentage tracking aligns correctly.

Fast charging not available on the ET50 after battery replacement

Fast charge on the ET50 requires the charge IC to complete one accepted full charge cycle before it negotiates higher current delivery with the charger. A brand-new cell starts that negotiation from scratch. If the tablet falls back to standard charge rates after a swap, plug into the original Zebra cradle or approved USB-PD charger and let it run a complete 0–100% charge without interruption. After that first accepted cycle, fast charge resumes at the next session. Attempting to restart the tablet mid-charge resets the negotiation and delays the process.