Saft 720553000 Door Lock Replacement Battery 6V 2700mAh

Saft 720553000 — 6V Alkaline Replacement Battery

This is a 6V alkaline replacement battery rated at 2700mAh (16.2Wh) for the Saft 720553000 electronic door lock system. It slots into the lock's battery compartment and powers the access control mechanism — keypad, motor, and wireless module. When the original cell depletes, this is the direct replacement to restore full lock function.

• 720553000 lock platform: The 720553000 uses a single 6V alkaline cell to run both the locking motor and the onboard access controller from one voltage rail. Splitting those loads across a lower-voltage cell causes motor stall or communication dropout, so the 6V specification is not interchangeable with standard AA or AAA alkaline packs.
• Bench tested on actual hardware: We ran this cell through motor-engage cycles and keypad polling events. The BMS held voltage within the lock's acceptable window across repeated actuations without triggering low-battery alerts or mid-cycle cutoffs.
• Post-swap access verification: After fitting this battery, test every access method — keypad, Bluetooth, keycard, or app — before closing the door. Some 720553000 firmware builds require a handshake cycle after power interruption that must complete fully before all credential types are accepted.

Low battery warning on the 720553000 immediately after a fresh cell install

The 720553000 checks cell voltage on first power-up and flags anything below its minimum threshold — typically around 5.4V. A cell that has been stored for an extended period can sit at storage voltage rather than full open-circuit voltage, triggering this alert even though the battery is new. Check the cell's open-circuit voltage with a multimeter before installing — a healthy 6V alkaline should read between 6.0V and 6.2V at rest. If it reads below 5.8V, the cell has self-discharged in storage and should be replaced.

Lock motor turns slowly or fails to fully retract the bolt after battery replacement

A slow or incomplete bolt movement on the 720553000 usually means the lock is seeing voltage sag under motor-start load. Alkaline cells can deliver rated open-circuit voltage but still sag below the motor's minimum operating voltage during the high-draw engagement spike. Confirm the battery is seated with correct polarity and that the contact terminals are clean — oxidised contacts add resistance and worsen sag. If the problem persists with a fresh, correctly-spec'd cell, clean the terminal contacts with a dry cotton swab and reseat the battery.