{"product_id":"sokkia-3d-layout-navigator-ln-150-replacement-battery-74v-2600mah-li-ion","title":"Sokkia BDC71 3D Layout Navigator LN-150 Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSokkia LN-150 \/ TP-L6 — 7.4V Li-ion Replacement Battery (BDC71)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh Li-ion pack is a direct replacement for the Sokkia BDC71 battery. It fits the 3D Layout Navigator LN-150 and the Pipe Laser TP-L6. Both instruments run the same voltage rail and accept the BDC71 form factor.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLN-150 and TP-L6 compatibility:\u003c\/strong\u003e\n    These two instruments share the same battery bay geometry, 7.4V nominal rail, and BMS handshake protocol. One BDC71-format pack works across both units without modification or adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the LN-150's power-on sequence and tracked BMS response during prism-search initialisation. The BMS held steady through the servo motor and sensor power-up spike without tripping or resetting.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration on the LN-150:\u003c\/strong\u003e\n    After installing a new pack, run a full calibration cycle through the instrument's menu before field deployment. The LN-150 maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff during LN-150 servo and sensor initialisation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the LN-150 powers on, the servo drive and prism-tracking sensor draw current simultaneously. This brief spike can exceed the trip threshold on a new or cold pack if the BMS has not been conditioned to the instrument's load profile. The result is an immediate shutdown that looks like a dead battery. Running the instrument through one full calibration cycle after a fresh install allows the BMS to register the expected load pattern and set appropriate cutoff margins for field use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack will not charge after sitting unused in the carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the BDC71 pack drops below approximately 2.5V per cell, the BMS enters a protection lockout and the Sokkia charger will not initiate a charge cycle — the charging LED may stay dark or flash an error. Place the pack on the charger and hold it there for up to 30 minutes; some chargers apply a low-current recovery pulse before switching to full charge. If the charger still shows no activity after 30 minutes, check cell voltage with a multimeter — a reading below 5.0V across the pack terminals indicates the cells have discharged past safe recovery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360543473754,"sku":"BWCS-SDC710SL-1","price":61.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360543506522,"sku":"BWCS-SDC710SL-2","price":72.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360543539290,"sku":"BWCS-SDC710SL-3","price":80.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDC710SL-1.webp?v=1778615963","url":"https:\/\/batteryweb.com\/products\/sokkia-3d-layout-navigator-ln-150-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}