ZTE Cricket A410 Replacement Battery 3.7V 1200mAh

ZTE Cricket A410 — 3.7V Li-ion Replacement Battery (A410)

This is a 3.7V, 1200mAh Li-ion cell for the ZTE Cricket A410 and compatible Calcomp A410 variants. It fits the original battery bay directly, using the same connector and form factor as the OEM unit. Capacity is sourced from the product specification — 1200mAh, 4.44Wh.

• Cricket A410 and Calcomp A410 compatibility: These variants share the same 3.7V nominal voltage rail, physical footprint (54.90 × 44.00 × 5.20mm), and connector pinout — one cell fits all listed models without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the A410 platform. The BMS accepted charge handshake correctly, and the protection circuit triggered at the expected low-voltage cutoff without fault codes.
• Fuel gauge recalibration on first cycle: After installing this cell, run one full discharge to automatic shutoff, then charge uninterrupted to 100% before normal use. The A410's fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step causes the percentage indicator to read incorrectly for the first several cycles.

Sudden shutdown at 20–30% on the Cricket A410

The A410 uses a basic fuel gauge IC that maps reported percentage to voltage. When a new cell has a slightly different discharge curve than the original, the phone can hit the hardware low-voltage cutoff — typically around 3.4–3.5V per cell — while the display still reads 20–30%. This is not a fault in the battery. The phone's modem and screen draw enough instantaneous current that voltage sags below the cutoff threshold before the gauge catches up. One full discharge-charge cycle recalibrates the coulomb counter and eliminates this behaviour in most cases.

Phone will not power on after storage with the new cell installed

Li-ion cells that sit in storage below approximately 2.5V trigger BMS lockout — the protection circuit opens and blocks current flow entirely, even from a charger. This can happen if the phone was stored discharged for weeks before the replacement cell arrived. To recover: connect to a wall charger (not a USB port) and leave it for 15–20 minutes without pressing the power button. The charge IC applies a trickle current that slowly brings cell voltage above the BMS re-enable threshold, typically 2.9–3.0V, at which point normal charging resumes.