{"product_id":"amadeo-a-lock-st50-replacement-battery-6v-390mah-alkaline","title":"Amadeo A-Lock ST50 Replacement Battery 6V 390mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAmadeo A-Lock ST50 — 6V Alkaline Replacement Battery (ST50.BP.02)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the replacement battery for the Amadeo A-Lock ST50 smart door lock. It runs at 6V alkaline chemistry with a 390mAh capacity. When the existing battery drains, this swap restores the electronic locking mechanism, keyless entry, and remote access control.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA-Lock ST50 compatibility:\u003c\/strong\u003e\n    The ST50 lock uses a dedicated battery module that supplies 6V directly to the motor driver and access control board. A mismatch in voltage or form factor causes the lock controller to reject the power source entirely — this unit matches the original module's rail and connector footprint.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through the ST50's full power-on sequence. The lock controller completed its BMS handshake, motor initialised without cutoff, and all access modes registered correctly before the door was closed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap access verification:\u003c\/strong\u003e\n    After inserting this battery, hold the door open and test every access method — keypad, Bluetooth app, and any registered keycards — before closing. The ST50 runs a firmware handshake after any power interruption, and access methods that haven't completed that handshake won't respond until it finishes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A-Lock ST50 beeps continuously after a new battery is inserted\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ST50 triggers a continuous beep sequence when its controller detects that supply voltage has dropped below the operational threshold during the handshake cycle. This happens when a replacement battery ships at storage voltage rather than full charge — alkaline cells can sit at 5.6–5.7V out of packaging, which the ST50's voltage monitor reads as depleted. The controller then enters a low-power alert loop instead of completing normal boot. Verify the replacement battery reads at or above 6V with a multimeter before insertion.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth app shows lock as offline after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ST50 Bluetooth module loses its active pairing state when power is fully interrupted — it does not persist the connection in non-volatile memory the same way the access code table does. After swapping the battery, the lock's Bluetooth radio re-initialises as an unconnected device. Open the app, navigate to the lock's device settings, and use the re-pair or reconnect function rather than adding a new device. Once the app confirms the connection, the lock resumes normal remote access without losing saved user codes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360211206234,"sku":"BWCS-AST500SL-1","price":16.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360211239002,"sku":"BWCS-AST500SL-2","price":18.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360211271770,"sku":"BWCS-AST500SL-3","price":20.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AST500SL-1.webp?v=1778610981","url":"https:\/\/batteryweb.com\/products\/amadeo-a-lock-st50-replacement-battery-6v-390mah-alkaline","provider":"BatteryWeb","version":"1.0","type":"link"}