Caterpillar S62 Pro Compatible Battery 3.8V 4000mAh

CATERPILLAR S62 Pro — 3.8V Li-Polymer Replacement Battery (APP00317)

This is a 3.8V, 4000mAh Li-Polymer replacement battery for the Caterpillar S62 Pro rugged smartphone. It carries OEM part number APP00317 and matches the original cell's dimensions at 72.20 x 59.50 x 5.70mm. Fit it when your S62 Pro no longer holds charge, shuts down unexpectedly, or the existing cell has swollen.

• S62 Pro cell fit: The S62 Pro runs a single Li-Polymer cell behind the rear panel. The BMS connector, cell dimensions, and voltage rail are specific to this model — cells from the S61 or S52 will not align with the connector or clear the chassis cavity.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the S62 Pro platform. The BMS accepted the cell without fault flags, charge termination triggered cleanly at 4.35V, and the coulomb counter tracked state-of-charge without jumps past the first full cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell, preventing early percentage reporting errors.

Sudden shutdown at 20–30% on the S62 Pro replacement cell

The S62 Pro's fuel gauge IC holds a discharge curve from the original cell. When a new cell goes in, the IC's stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. Under modem load or display-on bursts, the cell's real voltage drops below the IC's shutdown threshold before the reported percentage reaches zero. The phone cuts out at what looks like 20–30% remaining. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% resets the coulomb counter against the new cell curve and stops the premature cutoff.

USB-PD fast charge not activating on the first cycle after swap

After fitting this cell, some S62 Pro units will not accept the fast charge handshake on the first charging session. The charge IC reads the new cell's initial impedance as outside the expected range and falls back to standard 5V charging as a precaution. This is not a fault with the cell or the charger. Complete one full standard charge cycle to 100%, then reconnect — the charge IC rechecks impedance on the next session and the fast charge protocol resumes normally.