6V Alkaline Smart Lock Replacement Battery 2700mAh

Grainger 10A358 — 6V Alkaline Replacement Battery for Electronic Door Locks

This is a 6V alkaline battery rated at 2700mAh (16.2Wh), sourced as a direct replacement for the Grainger 10A358. It fits electronic deadbolts and smart lock mechanisms that run on a 6V alkaline supply. If your lock is beeping, failing to respond, or showing a low-battery indicator, this is the correct replacement specification.

• Electronic door lock compatibility: Smart locks and electronic deadbolts in this class share a 6V alkaline requirement because the motor drive circuit and wireless radio both pull from the same voltage rail. Dropping below threshold causes the lock to either beep continuously or stop responding entirely — not a lock fault, just voltage starvation.
• Bench tested on actual hardware: We ran this battery through a door lock test fixture simulating repeated motor actuations and Bluetooth polling cycles. The BMS held steady across full discharge, with no premature cutoff under the lock's combined draw profile.
• Post-installation access check: After replacing batteries, test every access method — keypad, Bluetooth, keycard — before closing the door. Some smart locks run a firmware handshake after a power interruption, and the lock will not accept all access methods until that sequence completes.

Why your smart lock keeps beeping after a fresh battery install

Some electronic locks store a low-battery flag in firmware that does not clear automatically when you swap batteries. The lock reads the flag first, before it checks actual voltage, so the beeping continues even with fresh cells installed. The fix is a power cycle: remove the batteries, wait 30 seconds for the capacitors to drain, then reinsert them. This forces the controller to re-read current voltage rather than the stored flag.

Lock motor turns but deadbolt stops halfway through the throw

A partial bolt throw usually means the motor is running but voltage is sagging under peak mechanical load. Even new alkaline batteries sitting in storage can self-discharge enough that their open-circuit voltage looks acceptable but collapses under motor-start current. Check that the batteries are fresh stock, not shelf-aged, and confirm the lock door alignment is not adding extra mechanical resistance. A correctly installed 6V fresh alkaline set should drive the bolt through its full throw without hesitation.