What drains the AA batteries on an AD-Series lock?

Causes for AA battery drain in AD-Series LOCKS
Possible Cause Fix/Corrective Action
1)      One the four (or eight) AA was inserted reversed and the reserved battery drains the other batteries. a.       Always make sure the polarity is correct on all AA by measuring the voltage of 6.5 – 6.4 for new AA four pack, 12 VDC for an eight pack, or visual inspection of battery polarity markings.
2)      The installation sequence was not followed when installing the radio board in an AD400 series lock. a. Always install the radio board first; before applying power with the AA batteries/Aux. The radio must already be installed during power up for proper system initialization.  A power cycle, of disconnecting and connecting the AA batteries/AUX, will also correct this issue.
3) The card reader is loose and not seated properly on the escutcheon. a) Make sure the seal between the reader and the escutcheon plate is seated in the groove and fitting well to the reader and escutcheon plate surface. See  the "Install Reader" step of the installation instructions. Proper installation of the seal is necessary.
4) The card reader is loose and not making contact or pin contacts in the plugs are bent and not making good contact. a. Without a reader the lock main board will consume 6.7 mA trying to communication to the missing reader. Within two weeks this will drain the batteries. Also a loose reader will not  read, beep or blink during this time. 
b. Make sure the lock is screwed tight to the door and reader is screwed tight through the lock with a seal in place.
5) Battery wire plug is smashed under the cover and damaging the AA battery. a.       Make sure the plug is positioned up and away and not being pinched between the cover and the batteries.
6)      The battery wring is pinched, and shorted causing current drain. a. Locate the battery wires and inspect to be sure they are correct and not pinched.
7) With 8 pack battery installation; always install the provided Mylar sheet between the battery pack and the escutcheon metal. a. The Mylar sheet prevents battery cases from shorting to the escutcheon metal base. See Installation step for "8 batteries."
8) Ribbon cable for the reader is pinched between the door and the  lock draining the battery. a. Locate the pinched wire. The ribbon cable is sometimes  pinched under the reader and outside escutcheon plate during filed re-handing for installation.
9) The outside of the lock, reader included, has gotten very wet casing battery current drain. a. Is the lock under an awning or protected by an overhang?
  b. If the lock is loose on the door water can get behind the reader and lock base during high winds.
10) Follow the proper procedure when changing the coin cell battery. a. Remove/unplug the AA batteries/AUX, removing power from the lock before you remove and replace a coin cell battery. This avoids damage and allows the proper power up sequence and initialization to occur. 
11)  An AD-Series Lock with just a Keypad (KP) only and Credential firmware 2.9.2 through 2.10.2 will draw too much current, and does not go to low current sleep mode.
ADFwPkg2.15.1.ffp was released on 1-11-2011 to remedy this issue, credential firmware version 2.12.0 and higher eliminates this issue. Install the newest FW found at Schlage Technical Support "schlage.com/support"  - see 56635 
Low current measurements for an AD-Series lock are dependent of the READER type and the reader settings. Below are the expected lowest current levels (Sleep Current) per lock/reader type. The current will greatly increase (briefly) with any radio transmission, LED flash, beep, card, key press or lever/lock movement.
Reader Type Typical Measurement (Sleep*) low current
AD-Series with a MT/MTK reader  70- 110 uA
 AD-Series with a SM/SMK or PR/PRK   70-100 uA
AD-Series with a MS/MSK/MG/MGK with low power wake up ON track 2.  20-40 uA
 AD-Series with MS/MSK/MG/MGK with Track 1 or 2 and low power wake up OFF.  260-300 uA
* Sleep current is the lowest power mode an AD-Series lock when the lock is inactive and waiting. Sleep current should not be measured until 30 seconds after power is applied. This 30 seconds is needed for the complete boot up and initialization of the AD-Series lock with power up. 

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