Boost Mobile Hydro 3.7V 1200mAh Compatible Battery

BoostMobile Hydro / Rise (C5170) — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh Li-ion battery for the BoostMobile Hydro, Rise, C5170, and KYC5170 smartphones. It fits inside the original battery bay and connects to the same contacts as the factory cell. Use it when the original battery no longer holds a charge or the phone shuts down unexpectedly under load.

• Hydro / Rise platform fit: The C5170 and KYC5170 share the same battery bay dimensions, contact layout, and 3.7V nominal voltage rail across the Hydro and Rise variants. One cell covers both models without adapter or modification.
• Bench tested on actual hardware: We ran this cell through the full charge cycle on a C5170 unit. The BMS accepted the charge handshake without error and held voltage above 3.6V across the discharge curve under active screen and radio load.
• First-cycle fuel gauge reset: After installation, disable fast charging if your charger supports it and run one complete discharge down to auto-shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC a clean reference curve for the new cell before it starts tracking percentage.

Sudden shutdown at 20–30% on the replacement cell

The Hydro's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell with a different internal resistance profile can hit the IC's low-voltage trip threshold while the display still shows 20–30%. The phone isn't reading the new cell accurately — it's firing a cutoff based on stale calibration data. Run one full discharge-to-shutdown and full recharge cycle to recalibrate the coulomb counter against the actual cell curve.

Phone warm near the battery on the first charge after a cell swap

A freshly installed cell has higher impedance than a broken-in one. The charge IC on the Hydro pushes a fixed current into that higher-impedance cell, which converts more energy to heat than it would with a conditioned battery. This is normal for the first one or two cycles and typically settles as the cell cycles through its initial charge-discharge passes. If warmth persists past the third charge cycle, check that the battery contacts are fully seated and not causing intermittent resistance.