About this replacement
Kyocera Hydro Vibe / C6725 — 3.7V Li-ion Replacement Battery (SCP-59LBPS)
This is a 3.7V, 1350mAh Li-ion cell that replaces the OEM battery in the Kyocera Hydro Vibe, C6725, C6730, and Hydro Icon smartphones. It fits the same physical bay and connector as the original SCP-59LBPS. Voltage and capacity match the stock spec exactly — no modifications needed.
- Hydro Vibe and C6725 / C6730 platform fit: These models share the same battery bay geometry, 3.7V rail, and connector pinout. One cell covers the full group. The BMS handshake is handled by the phone's charge IC, not the battery itself, so cell swap is straightforward.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Hydro Vibe unit. The charge IC accepted the cell without fault flags, and the BMS held voltage steady under display and modem load without tripping cutoff.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on this phone calibrates its coulomb counter against the cell's discharge curve — letting it run one full slow cycle first prevents early percentage errors and erratic jumps.
Sudden shutdown at 20–30% on the Hydro Vibe after a cell swap
This happens when the fuel gauge IC is still mapped to the old cell's discharge curve. The new cell has a slightly different voltage-to-capacity slope, so the phone reads 25% but the actual cell voltage under modem or screen load drops below the shutdown threshold before the gauge catches up. It is not a faulty battery. One full discharge down to auto-off followed by a full charge resets the coulomb counter. After that cycle, reported percentage and actual cutoff voltage align correctly.
Device won't power on after sitting in storage with a dead battery
If a Hydro Vibe sits discharged for weeks or months, the cell voltage can fall below 2.5V. At that point the phone's BMS locks out to prevent cell damage, and the device shows no response — no boot logo, no charging indicator. Connect the phone to a low-current charger (a standard 5V USB wall adapter, not a fast charger) and leave it for 20–30 minutes before pressing power. The BMS needs a trickle input to exit lockout before it will allow normal charge current. If the screen still shows nothing after 30 minutes, disconnect, wait 60 seconds, and reconnect — this resets the charge IC handshake.