SportDog TEK-H Replacement Battery 3.7V 1900mAh Li-Polymer

SportDog TEK-H Handheld Transmitter — 3.7V Li-Polymer Replacement Battery (SAC54-13815)

This 3.7V 1900mAh Li-Polymer battery replaces the OEM pack in the SportDog TEK-H and TEK-V1LT handheld transmitters, as well as the TEK V1L transmitter and TEK 1.5 GPS Collar. It restores power to the handheld unit you use to communicate with receiver collars during field training sessions. Dimensions are 49.10 × 29.30 × 13.20mm — confirm the pack size against your existing battery before fitting.

• TEK series transmitter compatibility: The TEK-H, TEK-V1LT, and TEK V1L share the same 3.7V battery form factor and connector pinout. The BMS in each unit handshakes at the same voltage threshold, so one pack covers the range without modification.
• Bench tested on actual hardware: We cycled this pack through the TEK transmitter's charge circuit and confirmed the BMS accepted charge without fault flags, held voltage above 3.6V through discharge, and triggered low-voltage cutoff cleanly before cell damage could occur.
• First GPS acquisition after install: After fitting a fresh battery, take the dog outside immediately and allow 5–10 minutes for the TEK system to complete its cold-start GPS fix. The unit has no almanac data after a full power interruption, so first lock takes longer than the warm-start updates you see during normal use.

Battery draining faster in open rural terrain than in suburban use

In low-signal areas, the TEK collar's GPS and cellular radios increase transmit power to maintain a fix and push location data. That extra radio load pulls more current from the pack than flat-terrain, strong-signal sessions do. The handheld transmitter also polls the collar more aggressively when signal is weak, adding to draw on that battery too. If your field sessions are in heavily wooded or remote areas, expect shorter intervals between charges compared to the rated figures measured under open-sky, good-signal conditions.

Collar stops syncing to the TEK app after a battery swap

A full power cycle clears the collar's active Bluetooth and cellular session state — it does not automatically re-register with the app. Open the SportDog TEK app, navigate to device management, and force a re-pair rather than waiting for the collar to reconnect on its own. If the app shows the collar as offline after pairing, check that the collar firmware completed its boot sequence by confirming the status LED is steady rather than still cycling. A steady LED confirms the unit is back at operational voltage and ready to sync.