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
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Amazon.com: Maxwel Manufacturing USB 9V Rechargeable Battery- 9 Volt High Capacity 650mAh Square Lithium Batteries with Type C Port Cable for Smoke Alarm Detector,Wireless Microphones & More (2-Pack) : Health & Household
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Amazon.com: Tenergy 2 Pack 9V Rechargeable Batteries and TN141 Charger, 9V NiMH Square Battery and 2 Bay 9V Battery Charger for Smoke Alarms and Detectors : Electronics
Home Maintenance: How To- Change Smoke Detector Battery - YouTube