User Guide

A: This can occur if the lock shackle is closed and opened again quickly before the motor has time to
relock the lock. Press any button on the lock keypad and when the lock lights green, close the lock and it
will light blue when locked.
BATTERY
Q: What type of battery does the 4400D use?
A: The 4400D comes with an installed CR2450 lithium button cell battery. For optimal performance,
Master Lock recommends the use of high-quality, name branded, batteries with an expiration date of 8-
10 years from the current year. Generic batteries often do not have the lifespan needed to support long
term usage.
Q: What type of battery does the 4401DLH use?
A: The 4401DLH comes with an installed CR2 lithium photo battery. For optimal performance, Master
Lock recommends the use of high-quality, name brand, batteries with an expiration date of 8-10 years
from the current year. Generic batteries often do not have the lifespan needed to support long term
usage.
Q: How long will the battery last in a Master Lock 4400D padlock?
A: The 4400D battery should last at least 2 years in Touch Unlock Mode and 4 months in Swipe Unlock Mode
with regular use.
Q: How long will the battery last in a Master Lock 4401DLH padlock?
A: The 4401DLH battery should last 5 years in Touch Unlock Mode and 2 years in Swipe Unlock Mode
with regular use.
Q: What if my lock battery dies?
A: If the lock battery dies while the lock is closed, it can be unlocked using an external battery. To
unlock the 4400D with an external battery:
1. If the battery dies when the lock is locked, pull the battery drawer out part way until it stops to
expose the jump contact point. Do not force the drawer open any further.
2. Hold a new CR2450 battery in the slot at a 45-degree angle, with the positive (+) side facing the
front of the lock.
3. While holding the battery in place, with an authorized mobile device within range of the lock,
press any button on the lock (if in Touch Unlock mode). If lock does not unlock, enter the
Primary Code on the lock keypad.
4. When unlocked, open the lock, pull out the battery drawer and install a new CR2450 battery.
5. Close the battery drawer.
To unlock the 4401DLH with an external battery:
1. If the battery dies when the lock is locked, pull down to remove the bottom cover.
2. Hold a 9V battery to the jump contacts on the bottom of the lock.
3. While holding the battery in place, with an authorized mobile device within range of the lock,
press any button on the lock (if in Touch Unlock mode). If lock does not unlock, enter the
Primary Code on the lock keypad.
4. When unlocked, open the lock and the battery door and install a new CR2 battery.