Parkside 2.0 Ah 12V A3 battery X12v

Connectors

• ID, tells the product which battery type is plugged it. Without the proper connection, the charger may overcharge, or ignore the battery

• T, Thermistor. The battery temperature; without it, the product may not accept the battery.

(Reddit:) The tool supplies 5 V to the "T" pin, which, if everything is fine, the battery switches a 20 kOhm nominal NTC resistor to ground. Because the tool has a 10 kOhm resistor in series with its "T" pin the voltage drops to 3.3 V and the tool is able to detect that and start working. (https://www.reddit.com/r/batteries/comments/jwfwit/cordless_tool_battery_terminal_identification/)