{"product_id":"nikon-dtm-302-replacement-battery-72v-3800mah-ni-mh","title":"NiKon BC-65 DTM-302 Replacement Battery 7.2V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNiKon DTM-302 \/ DTM-350 \/ DTM-330 Total Stations — 7.2V Ni-MH Replacement Battery (BC-65)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 3800mAh Ni-MH replacement for the NiKon BC-65 battery pack. It fits the DTM-302, DTM-350, DTM-330 total stations, and NPL-302 among others. These instruments share the same voltage rail and battery bay geometry, so one pack covers the full platform.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDTM \/ NPL platform compatibility:\u003c\/strong\u003e\n    The DTM-302, DTM-350, DTM-330, and NPL-302 all draw from the same 7.2V supply rail and use the identical BC-65 bay latch. The BMS handshake is voltage-threshold based — no proprietary chip authentication — so a correctly specced Ni-MH pack is accepted without error codes on boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge-discharge cycle and monitored BMS cutoff behaviour under simulated EDM and angle-encoder load. The cell voltage held above the 6.0V cutoff floor through sustained measurement sequences, and the BMS did not trip on the current spike at instrument wake-up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eField calibration before first deployment:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument's menu before taking it to site. The DTM series maps battery state during calibration. Skip this step and the instrument's low-battery threshold will be miscalibrated to the old cell's discharge curve, triggering false 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\"\u003eWhy the DTM-302 shuts down at EDM initialisation even with a charged pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DTM-302's electro-optical distance measurement module draws a short, sharp current spike when it initialises the laser emitter — typically lasting under 200ms but high enough to sag cell voltage momentarily. In an aged or partially discharged Ni-MH pack, this sag can cross the BMS low-voltage cutoff threshold, triggering an immediate shutdown. The instrument interprets this as a depleted battery even when the charge indicator showed green before the measurement attempt. A fresh pack with low internal resistance handles the spike without voltage collapse.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack will not charge after the instrument sat unused for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage — at roughly 1–2% per day under typical conditions. After several months unused, the pack voltage can drop below the charger's minimum detection threshold, causing the charger to show no activity or a fault light. Connect the pack to the NiKon charger and leave it for 30 minutes; many chargers apply a trickle pre-charge at this stage to recover cells sitting below 5.4V. If the charger still shows no response, check open-circuit voltage with a multimeter — a reading above 4.5V means the cells are recoverable and the charger should eventually begin the main charge cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360541835354,"sku":"BWCS-TRM350SL-1","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360541868122,"sku":"BWCS-TRM350SL-2","price":126.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360541900890,"sku":"BWCS-TRM350SL-3","price":140.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TRM350SL-1.webp?v=1778615963","url":"https:\/\/batteryweb.com\/products\/nikon-dtm-302-replacement-battery-72v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}