{"product_id":"jdsu-test-um-nt905-validator-replacement-battery-74v-2200mah-li-ion","title":"JDSU Test-Um NT905 Replacement Battery 7.4V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJDSU Test-Um NT905 Validator — 7.4V Li-ion Replacement Battery (NT93)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 2200mAh Li-ion pack replaces the OEM NT93 battery in the Test-Um NT905 Validator and the NT99, NT1150, and NT1155 series. It powers the instrument's active line-testing and connectivity validation circuits. Rated at 16.28Wh, it matches the original voltage and capacity spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNT905 \/ NT99 \/ NT1150 \/ NT1155 platform fit:\u003c\/strong\u003e\n    These models share the same 7.4V two-cell Li-ion rail, identical connector footprint, and a BMS handshake that authenticates pack voltage on startup — all four units pull from the same battery architecture.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on a field-equivalent load. The BMS held stable across the NT905's active measurement draw, with no mid-test cutoff events during probe initialisation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the NT905:\u003c\/strong\u003e\n    After fitting this pack, run the instrument through a full power-on calibration cycle before field deployment. The NT905 maps battery state during that sequence — skip it and the low-battery indicator will trigger early on your first real testing session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNT905 BMS lockout after the unit sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge over time. If the NT905 sat unused long enough, the pack voltage drops below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit locks the pack in a sleep state. At that point the instrument won't power on and won't register on a charger. Most NT93-format packs recover with a low-current pre-charge pulse held for 10–20 minutes before normal charging resumes. If the original OEM pack won't recover, that's the failure mode — a replacement pack resolves it immediately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNT905 shuts down mid-measurement with no low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the pack's cells have degraded enough that voltage sags sharply under the sustained draw of active line testing — even if the indicator showed a healthy charge before the session started. The NT905's power circuit has a hard undervoltage cutoff; when cell voltage dips below that threshold under load, the unit shuts off instantly with no warning. A fresh pack with full cell capacity holds voltage flat under that load. After fitting the replacement, run the post-install calibration cycle so the instrument recalibrates its voltage-to-percentage mapping to the new cells — this prevents the same symptom reappearing at incorrect state-of-charge readings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360624410714,"sku":"BWCS-JDT905SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360624443482,"sku":"BWCS-JDT905SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360624476250,"sku":"BWCS-JDT905SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JDT905SL-1.webp?v=1778616113","url":"https:\/\/batteryweb.com\/products\/jdsu-test-um-nt905-validator-replacement-battery-74v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}