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What type of battery is this? These were the batteries on my smoke alarms. These specifically have square connecting holes, which I can't seem to find. Does anyone have any names or
10/20 pcs 9V Battery Power Connector Snap Clip Adapter T-type I-type 9 V Wire 15cm 24AWG Holder Cable Lead Socket Plug Buckle - AliExpress
How to Make 9v Battery Connector for 9 volt batteries Out of Old 9v Battery, Sab Kuchh Banao Jano - YouTube