If you don’t have the proper tools then sure, that’s the safer approach.
The reverse-polarity battery fried my laptop’s USB port when I tried to charge it via the DSO so I’m not feeling as generous as I might otherwise have been. 
If you don’t have the proper tools then sure, that’s the safer approach.
The reverse-polarity battery fried my laptop’s USB port when I tried to charge it via the DSO so I’m not feeling as generous as I might otherwise have been.