BitLock has a micro-USB port that can be tapped into to power it externally to unlock if the battery dies suddenly when the bike is the locked. In order to access the micro-USB port, you must cut the plastic cover just below the LED light ( as shown below). After than use any standard micro-USB cable plus a phone charger or laptop with USB port to power the lock and open it.
If your lock is still under the 1 year limited warranty, we will send you a replacement. Otherwise, you can order a replacement at the discounted price of $49 excluding shipping fee.