Seals TS3 Replacement Battery 3.7V 1550mAh TS-02

Seals TS3 Series — 3.7V Li-ion Replacement Battery (TS-02)

This is a 3.7V, 1550mAh Li-ion replacement battery for the Seals TS3 smartphone, also sold as the T-S3, WP-TS3, and IP68 Water Proof variant. It replaces OEM part numbers TS-02 and TS-01. Physically, it measures 60.30 × 44.00 × 6.13mm — confirm those dimensions against your existing cell before fitting.

• TS3 and WP-TS3 compatibility: All variants in this lineup share the same 3.7V power rail, connector pinout, and BMS handshake. The IP68-rated WP-TS3 uses the same cell cavity and charge circuit as the standard TS3, so one cell covers the range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the TS3 platform. The BMS accepted charge negotiation without error flags, held voltage steady under screen and modem load, and cut off cleanly at the low-voltage threshold without false shutdowns.
• Fuel gauge recalibration on first cycle: After fitting this cell, disable fast charging and run one full discharge down to automatic shutoff, then charge to 100% uninterrupted. The TS3's fuel gauge IC calibrates its coulomb counter against the actual discharge curve of the new cell — skipping this step causes the OS to report inaccurate percentages for the first several cycles.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity fault. Under high-draw loads — active LTE, screen at full brightness, GPS — the cell voltage drops sharply before the fuel gauge expects it to. The TS3's protection circuit reads that voltage sag as critically low and cuts power to protect the cell. Running one full discharge-to-shutoff cycle lets the fuel gauge IC remap the actual voltage curve of the new cell, after which the OS tracks remaining charge accurately and shutdowns stop occurring at falsely high percentages.

Device not powering on after the battery sat in storage

Li-ion cells that discharge below roughly 2.5V per cell trip the BMS into lockout mode — the battery will not accept a standard charge and the phone appears completely dead. Connect the phone to a low-current USB source (a standard 5V/500mA wall adapter, not a fast charger) and leave it for 20–30 minutes before attempting to power on. This trickle current is usually enough to bring the cell above the BMS re-enable threshold. If the screen shows a charging indicator within that window, the cell has recovered; charge fully before use.