{"product_id":"geo-fennel-rotationslaser-fl-400-ha-g-replacement-battery-24v-8000mah-ni-mh","title":"Geo-Fennel FL 400 HA-G Replacement Battery 2.4V 8000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGeo-Fennel Rotationslaser FL 400 HA-G — 2.4V Ni-MH Replacement Battery (10-05506)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 2.4V Ni-MH 8000mAh replacement battery for the Geo-Fennel Rotationslaser FL 400 HA-G rotating laser level. It slots into the same battery compartment as the original pack and powers both the laser motor and the onboard electronics. OEM part numbers 10-05506 and GF-243000-18 both apply to this cell configuration.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFL 400 HA-G platform fit:\u003c\/strong\u003e\n    The FL 400 HA-G runs a single low-voltage rail at 2.4V, which dictates a two-cell Ni-MH pack. The connector orientation and BMS handshake are matched to this rail — swapping to a higher-voltage pack would overdrive the motor driver board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the FL 400 HA-G's motor-start sequence, which pulls a brief current spike as the rotation head reaches operating speed. The BMS held without tripping, and voltage recovered cleanly once the motor stabilised.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the FL 400 HA-G:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument menu before deploying on site. The FL 400 HA-G maps battery state during calibration — skipping this step causes premature low-battery warnings 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\"\u003eWhy the FL 400 HA-G throws a low-battery warning immediately after a new pack is fitted\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe FL 400 HA-G's battery indicator calibrates itself against the pack's voltage curve during the first calibration cycle — not at power-on. When a new Ni-MH pack goes in, the instrument has no reference for the new cells and defaults to a conservative threshold. This produces a false low-battery warning even on a fully charged pack. Running the calibration routine through the instrument menu clears this immediately. Until that cycle completes, the indicator reading is not meaningful.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFL 400 HA-G shuts off during grade alignment after sitting unused in a case\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day at room temperature. After several weeks in a carry case, the pack voltage can drop below the BMS recovery threshold — typically around 2.0V for a two-cell pack. At that point the instrument powers on briefly, draws current for the grade alignment sequence, and the BMS cuts output before the motor reaches speed. Slow-charge the pack at the instrument's standard charge rate for a full cycle first, confirming the terminal voltage reaches at least 2.6V before attempting a measurement session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360571195482,"sku":"BWCS-GFL400SL-1","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360571228250,"sku":"BWCS-GFL400SL-2","price":86.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360571261018,"sku":"BWCS-GFL400SL-3","price":94.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GFL400SL-1.webp?v=1778615988","url":"https:\/\/batteryweb.com\/products\/geo-fennel-rotationslaser-fl-400-ha-g-replacement-battery-24v-8000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}