{"product_id":"fluke-dtx-1200-m-replacement-battery-74v-5200mah-li-ion","title":"Fluke DTX-LION 7.4V 5200mAh Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFluke DTX-1200-M \/ DTX-1800-M Series — 7.4V Li-ion Replacement Battery (DTX-LION \/ BP7440)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 5200mAh Li-ion battery replaces the OEM DTX-LION and BP7440 packs in Fluke DTX-1200-M, DTX-1200-MS, DTX-1800-M, and DTX-1800-MS cable analyzers. These units are handheld copper and fiber certification testers used in the field where mains power is unavailable. Capacity is 5200mAh (38.48Wh) — drawn from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDTX-1200-M and DTX-1800-M series fit:\u003c\/strong\u003e\n    All four models share the same 7.4V battery bay, connector pinout, and BMS communication protocol. The DTX-1200-MS and DTX-1800-MS are the Smart Remote variants — they draw from the same battery circuit, so one replacement pack covers the full platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the DTX power-on sequence, full link calibration, and a sustained Cat 6A certification sweep. The BMS negotiated correctly with the instrument firmware, held stable voltage under the measurement processor load, and accepted a full charge cycle without faults.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCalibration cycle before first field deployment:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the DTX instrument menu before taking it to site. The DTX maps battery state during calibration — skip this step and the unit will flag low-battery warnings well before the pack is actually depleted 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\"\u003eDTX-1800-M shutting down mid-sweep during high-pair-count certification runs\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DTX-1800-M draws a short current spike each time it fires the measurement signal across a new pair combination during an Autotest. On a depleted or aged cell, that spike pulls the pack voltage below the BMS protection threshold, triggering a cutoff. The instrument interprets this as a hard power loss, not a battery warning — so you see an abrupt shutdown rather than a low-battery icon. A fresh 5200mAh cell maintains enough voltage headroom to absorb these spikes without tripping the BMS cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDTX showing inconsistent charge percentage at every reboot\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DTX series reads state of charge from a voltage-threshold table stored in firmware. A new cell has slightly different resting voltage characteristics than the original OEM pack the instrument was calibrated against. Until the DTX has seen at least one full charge-to-discharge cycle on the new pack, its percentage display will jump — commonly showing 40% at boot then climbing to 80% after a few minutes of use. Run one complete cycle: charge to full, run through a calibration sweep and a full Autotest session, then recharge. After that cycle, the percentage reading stabilises to within a few percent of actual state of charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360538853466,"sku":"BWCS-FBP740SL-1","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360538886234,"sku":"BWCS-FBP740SL-2","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360538919002,"sku":"BWCS-FBP740SL-3","price":116.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FBP740SL-1.webp?v=1778615946","url":"https:\/\/batteryweb.com\/products\/fluke-dtx-1200-m-replacement-battery-74v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}