About this replacement
Muratec KDS ATL-X6 Series — 3.7V Li-Polymer Replacement Battery (LTB-3H)
This is a 3.7V, 3600mAh Li-Polymer pack built to the LTB-3H spec. It fits the ATL-X6, ATL-96RG, ATL-66RG, ATL-46RG, and three additional ATL-series data collectors used in field surveying and land measurement. Capacity figures come from the product data sheet, not third-party estimates.
- ATL-series data collector compatibility: These models share the same 3.7V power rail, LTB-3H connector footprint, and BMS handshake protocol. Swapping between compatible ATL units carries no voltage mismatch risk — the BMS negotiates state-of-charge the same way across the family.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on an ATL-series unit. The BMS held charge termination cleanly at full capacity, and the protection circuit responded correctly to the current spike that hits during GPS module initialisation at power-on.
- Field calibration before first deployment: After installing this pack, run a full calibration cycle through the instrument menu before heading to site. The ATL-series maps battery state during that calibration sequence — skipping it causes the instrument to throw premature low-battery warnings on your first measurement session.
BMS cutoff during GPS module initialisation on the ATL-X6
When the ATL-X6 powers on, the GPS and GNSS receiver draws a sharp current spike as it acquires lock — this happens in the first few seconds after boot. A degraded or deeply discharged pack can drop voltage fast enough under that load to trip the BMS overcurrent threshold. The unit shuts off immediately, which looks like a power-on failure rather than a battery issue. If the pack rests above 3.6V on a multimeter before install, the BMS should clear the spike without tripping.
ATL-series data collector shuts down mid-logging session without a low-battery warning
During a sustained logging session, the combined draw from GPS lock, sensor polling, and display backlight can pull the pack voltage down steadily under load. If the pack's internal resistance has increased — common after prolonged storage or cell age — the voltage sag under that sustained load crosses the BMS undervoltage cutoff before the display indicator reaches the low-battery threshold. The instrument shuts off without warning because the indicator was reading resting voltage, not loaded voltage. Charge the pack fully to 4.2V and let it rest 10 minutes before the session to confirm resting voltage is stable.