They can take being landed in heavy grass with the motor still pulling tons of amps. I do it quite often by accident. I am 71. [:'(]
ABSOLUTLY no changes to the batteries. LIPOS would be puffing of trying to burst into flames. Either of those conditions wipes out the battery and means a replacement.

If you THINK CAREFULLY before cutting the jumper straps between the groups of 3's or 4 cells, you will NEVER risk soldering directly to a battery end. I always make each pack into 2..3 cells & 1.. 4 cell.

I now cut a 4 cell into 2..2 cells.. for a high KV motor used in pusher planes. Piece of cake.

Try to ONLY..ONLY solder to the cut in 1/2 jumper straps. It is possible to overheat a end of a cell if you solder without the strap on it. The welded on straps are very good connections.