About this replacement
Intellikey 100225 / PT00212L — 9V Lithium Replacement Battery (DL-20)
This is a 9V 3000mAh lithium replacement battery for the Intellikey 100225 and PT00212L electronic door lock systems. It supplies the voltage rail that drives the locking motor, keypad logic, and access control firmware. Part number DL-20 matches the original battery specification for these models.
- 100225 and PT00212L compatibility: Both models share the same battery compartment format, 9V supply requirement, and DL-20 part number. The lock controller draws from a single cell, so voltage and physical fit must be exact — an undersized or mismatched cell trips the low-battery threshold before the lock can operate normally.
- Bench tested on actual hardware: We ran this cell through motor actuation cycles on the lock mechanism and monitored the BMS response under door latch load. Voltage held steady through repeated lock and unlock events with no cutoff triggers at ambient temperature.
- Post-swap access method check: After fitting this battery, test every access method — keypad, any Bluetooth pairing, and physical override — before closing the door. Some Intellikey firmware requires a completed handshake after power interruption before all entry modes are recognised again.
Why the 100225 lock beeps "low battery" immediately after a new cell is installed
The Intellikey 100225 controller samples voltage within seconds of power-up and compares it against a stored threshold. Lithium cells that have been sitting in storage for over a year can read slightly below that threshold on cold start — even if capacity is intact. The fix is to seat the battery firmly, close the compartment, and let the lock complete its startup sequence without pressing any keys. If the warning clears within 30 seconds, the cell is fine. If it persists, check that the battery reads at least 9V under load with a multimeter before condemning it.
Bluetooth not reconnecting to the lock after a battery swap
A full power interruption — even a brief one during a battery change — can drop the lock's Bluetooth advertising state on certain firmware versions. The lock is powered and functional, but the app shows the device as offline or unavailable. Remove the battery, wait 10 seconds, reinsert it, and allow the lock to complete its boot cycle before opening the app. If the app still does not detect the lock, trigger a fresh scan rather than relying on a cached device entry — the lock's advertised address can shift after a hard reset.