{"product_id":"viavi-120-dsp-replacement-battery-37v-2600mah-li-ion","title":"Viavi 120 DSP Compatible Battery 3.7V 2600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eViavi 120 DSP \/ Seeker Series — 3.7V Li-ion Replacement Battery (0090048000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2600mAh Li-ion cell replaces OEM part 0090048000 in the Viavi 120 DSP and Seeker family of fiber optic leakage detectors. It fits the Seeker, Seeker D, and Seeker D Lite alongside the 120 DSP. Capacity is 9.62Wh — matching the original pack's energy rating.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e120 DSP and Seeker platform fit:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one pack covers all variants listed. The battery communicates state-of-charge to the instrument's firmware, so the cell must match the original voltage curve exactly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and full optical-scan load sequences on a 120 DSP. The BMS held cutoff voltage cleanly at the low-cell threshold and accepted a full charge cycle without triggering protection flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration on the 120 DSP:\u003c\/strong\u003e\n    After installing, run a full calibration cycle through the instrument menu before field deployment. The 120 DSP maps battery state during calibration — skipping this step causes premature low-battery warnings on 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 lockout after a Viavi 120 DSP sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the 120 DSP sat idle long enough, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit locks out the charge path entirely. The instrument shows no charging activity and may not power on at all. Connecting to a charger that supports trickle or pre-charge mode at low current can nudge the cell voltage back above the recovery threshold and re-enable normal charging. If the cell has dropped below 2.0V, recovery is not always possible and a replacement pack is the correct fix.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003e120 DSP shuts down during USB data transfer to a PC\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUSB data transfer pulls current from the same power rail as the optical circuitry. When both loads run simultaneously, total draw can spike past what a partially discharged or degraded cell will sustain — the BMS trips on undervoltage and the unit cuts off mid-transfer. This is not a firmware fault. Charge the pack to at least 3.9V before initiating any USB export session. If shutdowns continue on a fully charged pack, the cell's internal resistance has risen enough that it can no longer hold voltage under combined load — replace the battery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360448675930,"sku":"BWCS-VSD120SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360448708698,"sku":"BWCS-VSD120SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360448741466,"sku":"BWCS-VSD120SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VSD120SL-1.webp?v=1778614760","url":"https:\/\/batteryweb.com\/products\/viavi-120-dsp-replacement-battery-37v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}