Kyocera Echo SCP-39LBPS Compatible Battery 3.7V 1100mAh

Kyocera Echo / M9300 — 3.7V Li-ion Replacement Battery (SCP-39LBPS)

This 3.7V, 1100mAh Li-ion cell replaces the OEM SCP-39LBPS / KABA-01 battery in the Kyocera Echo, M9300, and SCP-9300. The Echo is a dual-screen Android smartphone — both displays draw from this single cell, so a degraded original battery causes rapid shutdowns under load. Dimensions are 61.61 × 43.54 × 4.31mm, matching the factory battery bay.

• Echo, M9300, and SCP-9300 compatibility: All three models share the same battery bay dimensions, voltage rail, and connector pinout. The BMS handshake across this platform is identical, so one cell covers all three without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Echo platform. The BMS accepted the cell without error flags, and protection circuits triggered correctly at both low-voltage cutoff and charge termination.
• Fuel gauge recalibration on first use: After installing this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before heavy use. The Echo's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes inaccurate percentage readings from day one.

Sudden shutdown at 20–30% on the Echo's dual-display load

The Echo draws significantly more current when both screens are active simultaneously. A degraded or poorly calibrated cell hits a voltage cliff — internal resistance rises fast enough that the battery management system cuts output before the reported percentage reaches zero. This is a voltage-sag failure, not a capacity failure. Installing a fresh cell resolves the cutoff, but the fuel gauge IC still needs one full cycle to map the new cell's discharge curve accurately.

Phone won't power on after sitting in storage

Li-ion cells self-discharge during storage. If the Echo has been unused for months, the cell voltage may have dropped below 2.5V — the point where the BMS locks out to prevent damage. The phone will show nothing when you press power or connect a charger. Connect to a wall charger and leave it for 15–20 minutes without touching the power button; the charge IC needs time to trickle current into the cell before the BMS will re-enable output. If the screen still won't respond after 30 minutes on charge, check that the battery contacts are fully seated.