{"product_id":"techcell-pr122dg-replacement-battery-74v-2600mah-li-ion","title":"Techcell PR122DG 7.4V Laser Distance Meter Compatible Battery 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTechcell PR122DG — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh (19.24Wh) Li-ion battery replaces the original pack in the Techcell PR122DG laser distance measuring device. It fits handheld instruments used in construction, surveying, and professional fieldwork. Dimensions are 70.40 × 38.70 × 20.50mm — confirm your original pack matches before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePR122DG platform fit:\u003c\/strong\u003e\n    The PR122DG laser distance tool runs a 7.4V rail with a two-cell Li-ion configuration. This pack matches that voltage rail and physical form factor, so the BMS handshake completes correctly at startup without triggering a battery error flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through repeated measurement and sensor-initialisation cycles. The BMS held steady through the current spike at laser module power-up — the point where worn packs most often trip the protection circuit and shut the instrument down.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration cycle:\u003c\/strong\u003e\n    After installing, run a full calibration sequence through the instrument menu before taking it to site. The PR122DG maps battery state during calibration — skipping this step causes premature low-battery warnings during the 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 lockout after the PR122DG sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge slowly in storage. If the PR122DG sat unused long enough, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or 5.0V total for a 2S pack. At that point the BMS latches into sleep mode and blocks charge input entirely. Standard chargers see zero current draw and stop, so the pack appears dead. A slow trickle charge at low current for 15–30 minutes can bring cell voltage back above the recovery threshold and unlock the BMS — after which normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings resetting or drifting mid-session on a battery that looks charged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSustained sensor load during a logging session draws more continuous current than a single point measurement. If cell capacity has degraded, internal resistance rises and voltage sags under that sustained draw. The instrument interprets the voltage sag as a low-battery condition and resets the active session to protect data integrity. This is not a firmware fault — it is a cell capacity problem. Replace the pack and confirm resting voltage sits at or above 8.2V after a full charge cycle before the next field deployment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360792903770,"sku":"BWCS-LI1XL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360792936538,"sku":"BWCS-LI1XL-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360792969306,"sku":"BWCS-LI1XL-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1XL-1.webp?v=1778616260","url":"https:\/\/batteryweb.com\/products\/techcell-pr122dg-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}