Today I noticed the battery that was on board in each quadcopter crash was a little soft to the touch and round. Although the battery seem to behave normally meaning that it never really died quickly, had a single bad cell, or got very hot, I noticed that after flying my hexacopter for about 10 minutes it started to behave slightly erratically like my quad copters did just prior to crashing. I brought it down immediately and luckily did not crash the hexacopter. The new battery is obviously the rounded one. The other battery is new. It is not rounded and rock hard to the touch unlike the soft jelly feeling blue battery.