{"product_id":"komshine-ex39-replacement-battery-108v-3400mah-li-ion","title":"KomShine EX39 Replacement Battery 10.8V 3400mAh BTR-34S","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKomShine EX39 \/ Fusion Splicer — 10.8V Li-ion Replacement Battery (BTR-34S)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V 3400mAh Li-ion battery for the KomShine EX39 and compatible Fusion Splicer units. It replaces OEM part number BTR-34S. Capacity figures match the product data — 36.72Wh at rated voltage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEX39 and Fusion Splicer platform fit:\u003c\/strong\u003e\n    Both the EX39 survey instrument and the KomShine Fusion Splicer draw from the same 10.8V bus and use the same BTR-34S pack format, connector, and BMS handshake. One battery covers both devices if you run both in the field.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through power-on cycles and simulated sensor load sequences. The BMS held voltage within the expected window under sustained draw and did not trip during the initialisation spike typical of probe and sensor modules at startup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eField calibration before first deployment:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the EX39 instrument menu before heading out. The instrument maps battery state during calibration — skip this step and the low-battery warning triggers early on your 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 cutoff when the EX39 probe module initialises\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the EX39 powers up its probe or sensor module, there is a short current spike as the module draws power for initialisation. An aged or deeply discharged pack can drop below the BMS cutoff threshold at that exact moment, killing the instrument before a reading starts. This is not a wiring fault — it is the BMS protecting cells that cannot hold voltage under the spike. A fresh pack at full charge handles the surge without tripping. If you see this with a new battery, charge to full and retry before assuming a fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEX39 shows inconsistent battery percentage across reboots\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new BTR-34S pack, the percentage indicator on the EX39 display may jump or read differently on successive power cycles for the first few charge sessions. The instrument's voltage-threshold indicator is recalibrating to the new cell's discharge curve, which differs slightly from a worn OEM pack. This settles after two to three full charge-discharge cycles. If the display still reads erratically after three cycles, check that terminal voltage at the pack is at or above 12.4V after a full charge before assuming a fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306865197146,"sku":"BWCS-KFE390SL-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306865229914,"sku":"BWCS-KFE390SL-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306865262682,"sku":"BWCS-KFE390SL-3","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KFE390SL_1.webp?v=1777768837","url":"https:\/\/batteryweb.com\/products\/komshine-ex39-replacement-battery-108v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}