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Here is a picture of what the battery pack and connector looks like.
@RomanW9, did you find a solution? I too am attempting the same thing. I have Schlage Connect locks I want to power on A/C but want to trickle charge batteries as backup."@DIY Hacks and How Tos" how might your how-to differ to be able to trickle charge the batteries? My lock specifically has 4 AA batteries. I am thinking of just buying a 6V 1000 mAh adapter. My batteries sit in a battery tray that is connected to the device by a 9-volt connector (simply used as a way to connect/disconnect and allow for removal of the battery tray).Thanks for the tutorial, really great.
Raspberry Pi - SMS Garage Door Butler