Established theory I reckon Risky battery low voltage protection Company Can not Citizen
1 Piece of DC 12V36V Voltage Protection Module, Discharge Protection Module, Low Disconnect - Walmart.com
Amazon.com: 6-48V Battery Charging Controller Module, Battery Low Voltage Cut Off Automatic Switch On Protection Undervoltage Controller, for Under Voltage Control Over-discharge Protection : Electronics
Make a Battery Protection Circuit (low Voltage Cut-off) - Instructables
Dc 12v Battery Low Voltage Cut Off On Switch Controller Excessive Protection Module With Digital Led Display For Car Motor - Integrated Circuits - AliExpress
Tebru Undervoltage Protection Controller, 12V Battery Low Voltage Cut off Automatic Switch On Protection Undervoltage Controller, Low Voltage Cut off Switch - Walmart.com
Best Under Voltage Protection Circuit Diagram For 12V Battery
batteries - Using a voltage supervisor IC to protect a Li-Ion battery from undervoltage >2.8V? - Electrical Engineering Stack Exchange
Low Battery Shutoff PCB Board | Partsbuilt 3D
Amazon.com: Low Voltage Disconnect, Icstation DC 6V-60V Low Voltage Cutoff with LCD Display 30A Low Voltage Protector Disconnect Switch Module Charging Discharging Protection Board for Lead Acid Lithium Battery : Automotive
12-36V Battery Low Voltage Over-discharge Disconnect Protection Module DC Output | eBay
DC 12V Battery Undervoltage Low Voltage Cut off Automatic Switch Recovery Protection Module Charging Controller Protection Board|Integrated Circuits| - AliExpress
12V Battery Low Voltage Turn Cut off Switch Over Discharge Protection Module | eBay
Low Battery Voltage Cut-off OR Disconnect
Amazon.com: 2 PCS Low Voltage Cutoff, Icstation DC 12V-36V Low Voltage Disconnect 20A Over Discharge Protection Low Voltage Protector Disconnect Switch Module for Lead Acid Lithium Battery Solar Panel Light : Tools
Low Voltage Disconnect - DIY Solar Power - Made Easy!
Lm358 12v Lithium Battery Low Voltage Alarm Buzzer Lipo-lion Under Voltage Protection Module With Led Indicator - Buy Lm358,12v Battery Protection Module Discharge Board Anti-o,Battery Over Discharge Protection Product on Alibaba.com
XH-M609 DC 12V-36V Charger Module LED Low Voltage Display Battery Disc – eElectronicParts
Buy Low Voltage Disconnect LVD Switch | Battery life × 2
Low Battery Voltage Cut-off OR Disconnect
Powerwerx Compact Low Voltage Disconnect (LVD) Battery Guard | Powerwerx
4.5µA Li-Ion Battery Protection Circuit | Analog Devices
12V Battery Low Voltage off Excessive Discharge Protection 30A Switch Module | eBay
How To Make Low Voltage Battery Cut-Off Circuit || Battery Protector - YouTube
Make a Battery Protection Circuit (low Voltage Cut-off) - Instructables