{"product_id":"laser-alignment-laser-beacon-lb-4-replacement-battery-84v-8000mah-ni-mh","title":"Laser Alignment LB-4 Ni-MH Replacement Battery 8.4V 8000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLaser Alignment Laser Beacon LB-4 — 8.4V Ni-MH Replacement Battery (LB-4 \/ LB-4C)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 8.4V, 8000mAh Ni-MH battery replaces the original pack in the Laser Alignment Laser Beacon LB-4. It fits using OEM part numbers LB-4 and LB-4C. The Laser Beacon LB-4 is a rotating laser unit used for alignment and leveling on construction and surveying sites.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLaser Beacon LB-4 fit:\u003c\/strong\u003e\n    The LB-4 and LB-4C share the same voltage rail, connector geometry, and BMS handshake profile. This battery covers both part number variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through charge and discharge cycles on the LB-4 platform. The BMS accepted the pack without fault codes, and the self-leveling motor spun up cleanly at full voltage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eWarm-up after battery swap:\u003c\/strong\u003e\n    After fitting a new or freshly charged pack, wait two minutes before taking measurements. The self-leveling motor and laser module both need the voltage to stabilize before the unit reaches calibrated output. Measurements taken during warm-up will be off.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the LB-4 loses beam accuracy as the battery drains\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Laser Beacon LB-4 runs both its rotating motor and laser diode from the same battery pack. As voltage drops toward the lower end of the Ni-MH discharge curve, the motor slows slightly and laser output dims. Both the rotation speed and the diode power level are voltage-sensitive, so accuracy degrades before the unit shuts off. Replacing or recharging before voltage sags below 7.2V keeps the unit operating within spec.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAuto-leveling stalls or fails to complete after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe leveling motor in the LB-4 draws a short current spike on startup. If the replacement battery is not fully charged, that spike can pull voltage below the BMS protection threshold and trip a cutoff before leveling completes. The unit will appear to power on but the laser will not begin rotating. Charge the battery to full — confirmed by the charger switching to maintenance mode — then reinstall and power on fresh.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381278343258,"sku":"BWCS-LCB400SL-1","price":200.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381278376026,"sku":"BWCS-LCB400SL-2","price":237.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381278408794,"sku":"BWCS-LCB400SL-3","price":266.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LCB400SL-1.webp?v=1778899901","url":"https:\/\/batteryweb.com\/products\/laser-alignment-laser-beacon-lb-4-replacement-battery-84v-8000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}