Amazon Turntable Owners: Where Do You Source Replacement Battery Packs

Wanted to reach out to owners of the Amazon turntables. I wanted to know where you are sourcing your battery packs from. From what I see in the motor pod body you need a battery that is 131.77 mm. I am not even sure the battery in this table is an appropriate one. It is a 7.2 V 3300 mAh battery. Is this an appropriate replacement?

Please share where you are getting your batteries please!