{"product_id":"saflock-s90040-replacement-battery-6v-2700mah-alkaline","title":"Saflock S90040 6V Replacement Battery 2700mAh Alkaline","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSaflock S90040 \/ Select 6 — 6V Alkaline Replacement Battery (6800-12-1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V alkaline replacement battery rated at 2700mAh (16.2Wh) for the Saflock S90040 and Select 6 electronic door lock range. It matches OEM part numbers 6800-12-1 and HTL-6. If your lock is showing a low-battery alert or has stopped responding, this is the correct cell to swap in.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS90040, Select 6, and 6800121 compatibility:\u003c\/strong\u003e\n    These models share the same 6V power rail, the same physical housing slot, and the same BMS handshake threshold. One battery SKU covers all three variants without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the S90040 lock controller and confirmed the BMS accepted the voltage within the expected initialisation window. The motor actuated cleanly and the keypad returned a ready state on the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap access method check:\u003c\/strong\u003e\n    After fitting this battery, test every access method — keypad, Bluetooth, and keycard — before closing the door. The S90040 performs a firmware handshake on power restore, and some access credentials will not authenticate until that sequence completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLock beeping low-battery warning immediately after a fresh battery install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome S90040 units hold a residual low-voltage flag in firmware that does not clear the moment a new battery makes contact. The controller polls voltage at a fixed interval after boot — it needs a few seconds to register the new reading and overwrite the fault state. Remove the battery, wait ten seconds, then reinsert it firmly. If the beeping continues after that, measure the cell voltage at the terminals; a fresh alkaline should read at or above 6.0V at rest.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth fails to connect to the lock after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA hard power interruption — even a brief one during a battery swap — drops the Bluetooth stack on the Select 6 and S90040 controllers. The lock radio re-initialises, but the paired device retains a stale session key that no longer matches. Open your lock's companion app, remove the lock from paired devices, and re-add it from scratch. Once the pairing handshake completes at full 6V supply, Bluetooth should connect and stay stable.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360219136090,"sku":"BWCS-DRL190SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360219168858,"sku":"BWCS-DRL190SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360219201626,"sku":"BWCS-DRL190SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DRL190SL-1.webp?v=1778610981","url":"https:\/\/batteryweb.com\/products\/saflock-s90040-replacement-battery-6v-2700mah-alkaline","provider":"BatteryWeb","version":"1.0","type":"link"}