Cricket R710 Suede Replacement Battery 3.7V 800mAh EB664239HA

Cricket R710 Suede — 3.7V Li-ion Replacement Battery (EB664239HA)

This is a 3.7V, 800mAh Li-ion replacement battery for the Cricket R710 Suede, SCH-R710, and Suede Touch smartphones. It uses OEM part number EB664239HA and slots into the same battery bay as the original cell. Replace this when the phone shuts down unexpectedly, drains faster than normal, or won't hold a charge through a full day of light use.

• R710 Suede / SCH-R710 / Suede Touch compatibility: All three model designations share the same battery bay dimensions and connector pinout, which is why one cell covers the full group. The BMS communicates over the same data line across all three variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the R710 platform and confirmed the BMS handshake completed without fault codes. Voltage held stable at 3.7V nominal across the full discharge curve under screen and radio load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before reporting accurate percentages to the OS.

Sudden shutdown at 20–30% on the R710 Suede after a cell swap

This is a voltage cliff issue, not a capacity problem. At 20–30% state of charge, the new cell's voltage drops faster than the old calibration curve in the fuel gauge IC expects. When the modem fires or the screen peaks, the instantaneous current draw pulls cell voltage below the BMS cutoff threshold — the phone shuts off even though the reported percentage still looks safe. One full discharge-charge cycle resets the coulomb counter and trains the fuel gauge IC against the actual voltage curve of the replacement cell. After that cycle, shutdowns at falsely high percentages stop.

OS reporting wrong battery percentage after installing the new cell

The fuel gauge IC on the R710 Suede stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches actual cell chemistry, so the percentage readout drifts — often jumping several points or plateauing at an incorrect level. This isn't a fault with the replacement battery; it's the IC recalibrating. Drain the phone fully until it powers off on its own, then charge uninterrupted to 100% with fast charging disabled. After that single cycle, the coulomb counter resets to the new cell's curve and percentage accuracy returns.