{"product_id":"moli-mcc1821-replacement-battery-74v-3400mah-li-ion","title":"Trimble MCC1821 Replacement Battery 7.4V 3400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMOLI MCC1821 \/ MCR-1821 Series — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 3400mAh (25.16Wh) lithium-ion battery for Trimble data collectors and GPS positioning devices. It fits the MCC1821, MCR-1821, MCR-1821C, and MCR-1821C\/1 series, along with thirteen additional compatible models. This is the battery these instruments use during extended field sessions away from charging infrastructure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMCC1821 and MCR-1821 platform compatibility:\u003c\/strong\u003e\n    These models share the same 7.4V power rail, physical form factor, and BMS handshake protocol — one pack covers the full range. Swapping between MCC and MCR variants does not require firmware changes or hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through a Trimble data collector while logging GPS position data under continuous sensor load. The BMS held voltage within tolerance throughout, and the instrument reported state-of-charge accurately across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on Trimble instruments:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument menu before field deployment. Trimble devices map battery state during that routine, and skipping it causes the low-battery indicator to trigger early — well before actual capacity is exhausted — on the 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 when the instrument sits 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 pack drops below approximately 2.5V per cell — around 5.0V total for a 7.4V nominal pack — the BMS enters a protective sleep state and blocks charge input entirely. The charger shows no activity, and the instrument will not power on. To recover the pack, apply a low-current pre-charge using a Li-ion compatible charger that supports recovery mode; this brings the cells back above the BMS wake threshold, typically 3.0V per cell, before normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoltage dropout during sustained GPS logging causing readings to reset mid-session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the instrument runs continuous RTK or static observation, the combined draw from the GNSS module, display, and data logging can sustain a current pull that causes momentary voltage sag. If the pack's cells have aged or were stored in a partially discharged state, this sag dips below the instrument's cutoff threshold and triggers a reset. The instrument restarts, the current logging session ends, and any unsaved data is lost. Charge the pack fully before deployment — confirm the charger LED shows complete before disconnecting — and check that the terminal voltage reads at or above 8.2V before inserting into the instrument.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360754565210,"sku":"BWCS-LI1HL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360754597978,"sku":"BWCS-LI1HL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360754630746,"sku":"BWCS-LI1HL-3","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1HL-1.webp?v=1778616259","url":"https:\/\/batteryweb.com\/products\/moli-mcc1821-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}