Are NiZn batteries good for PF

Hi, I have a large collection of PF parts. Are NiZn batteries safe to use with the motors? I have thought about Li ion batteries, but the voltage is lower than in case of NiZn. Edit: I also consider buying Ni-MH battery pack 9.6V and making a custom connector from PF cable. It has good price in Aliexpress, around 10€ with charger submitted by /u/Artegonit [link] [comments]