{"product_id":"topcon-gts-3-replacement-battery-72v-2700mah-ni-mh","title":"Topcon BT-24QW GTS-3 Replacement Battery 7.2V 2700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTopcon GTS-3 \/ GTS-3A — 7.2V Ni-MH Replacement Battery (BT-24QW)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 2700mAh Ni-MH replacement for the Topcon BT-24QW battery pack. It fits the GTS-3 and GTS-3A total stations — theodolite and EDM instruments used in surveying and construction layout. Capacity is rated at 19.44Wh and matches the original pack specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGTS-3 and GTS-3A compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, voltage rail, and BMS handshake protocol. The connector orientation and cell count are identical across the GTS-3 and GTS-3A platforms, so one pack covers both instruments.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the GTS-3 charge circuit and confirmed the BMS accepted the cell chemistry without triggering a fault flag. The instrument completed a full charge cycle and passed the battery status check on the instrument display.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCalibration cycle before first field use:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument menu before deploying to site. The GTS-3 maps battery state during calibration. Skipping this step causes premature low-battery warnings during the first measurement session, even with a fully charged pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the GTS-3 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–3% per day at room temperature. After several months in storage, pack voltage can drop below the BMS recovery threshold — typically around 6.0V for a 7.2V Ni-MH pack. When this happens, the charger may not initiate a charge cycle because the BMS presents the pack as faulty rather than deeply discharged. Some chargers include a recovery or trickle mode that applies a low current to bring the cell voltage back above the threshold before switching to normal charge. If the Topcon charger does not recover the pack automatically, try a compatible Ni-MH charger with an explicit recovery function, then return to the standard charger once voltage reads above 6.5V.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGTS-3 shuts down mid-angle measurement with no low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the EDM module fires and the combined current draw — servo motor, EDM emitter, and display — causes a brief voltage sag that the BMS reads as a fault condition. It is not a capacity problem; it occurs most often with aged or partially discharged cells where internal resistance has increased. A freshly charged pack at full capacity reduces internal resistance and keeps the voltage rail stable under that spike load. If shutdowns continue after a full charge, check that the battery contacts on the instrument bay are clean and making full contact — resistance at the connector adds to the sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360579977306,"sku":"BWCS-TOP241SL-1","price":232.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360580010074,"sku":"BWCS-TOP241SL-2","price":273.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360580042842,"sku":"BWCS-TOP241SL-3","price":304.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOP241SL-1.webp?v=1778616006","url":"https:\/\/batteryweb.com\/products\/topcon-gts-3-replacement-battery-72v-2700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}