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..so called because it is a switch and it also has firmware that determines the type of battery in use and thus its safe discharge limit.
This contains significant intellectual property and so I do not describe it in detail, beyond the basic switch principles.
The assembly is contained in a waterproof, flexible cover that allows the oversize on/off button to be pressed, even in gloved hands.
Note the use of Deans connectors for input and output power.
If the sensor determines that the safe discharge limit has been reached a red LED glows and the switch will not operate.