CAT B30 Replacement Battery 3.7V 1200mAh 1ICP5/3450

CAT B30 — 3.7V Li-ion Replacement Battery (1ICP5/3450 1S1P)

This 3.7V, 1200mAh Li-ion cell replaces the original battery in the CAT B30 rugged smartphone. It matches the OEM part number 1ICP5/3450 1S1P and fits the B30's battery bay without modification. Dimensions are 53.00 × 33.90 × 5.70mm — confirm your bay before installing.

• CAT B30 fit: The B30 uses a single removable cell on a 3.7V nominal rail. This replacement matches the connector tab layout and cell footprint, so the phone's charge IC and fuel gauge IC receive the correct voltage reference on startup.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the B30 platform. The BMS accepted the cell without flag, and the charge IC stepped through its CC/CV stages cleanly with no thermal trip.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one complete discharge-to-charge cycle. The B30's fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle lets it map the new curve accurately before you rely on the percentage reading.

Sudden shutdown at 20–30% on the CAT B30 after a cell swap

The B30's fuel gauge IC stores a learned discharge curve from the previous cell. When a new cell goes in, the stored curve no longer matches actual cell voltage under load. The modem radio and screen draw current spikes that collapse voltage on a fresh, uncalibrated cell — the phone reads 25% but the cell voltage drops below the 3.2V cutoff threshold under that surge. One full discharge cycle down to automatic shutdown, then a full charge, forces the coulomb counter to relearn the new cell's curve. After that, percentage readings track correctly and the premature shutdowns stop.

CAT B30 not powering on after the replacement cell sat in storage

Li-ion cells self-discharge in storage. If this cell shipped or sat unused for several months, its resting voltage may have dropped below 2.5V per cell — the BMS lockout threshold. At that point the BMS disconnects the output rail entirely and the phone shows no response to the power button. Connect the phone to a wall charger, not a PC port, and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell until voltage climbs above 2.8V, at which point the BMS re-enables the output rail and the phone will boot. If the charge indicator never appears after 30 minutes on a wall adapter, check the charger output is at least 5V 1A.