Engineering Kit R2 - Incorrect Battery connection to the board in the kit

Hi,
want to warn you that the wires of the battery holder mapped incorrectly to the board. The black wire is connected to “-” of the battery and “+” of the board connector. The red wire is connected to “+” of the battery and “-” of the board connector.

Another problem is that there are no mapping labels on the battery.

Unfortunately, I realised this after connected the battery to the board and the battery started to burn. Now the BAT LED is always on, not sure if it is not damaged. I am absolutely new to the electronics, is it safe to continue use it like this?

On mine, the red cable is properly connected to the flat/+ side of the yellow plug. Which is different than the one in your photo. You can check with a voltmeter, I've seen them for less than $5 USD online.

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