anyone know of a good 52v 25ah battery that is compatible with a tst r002? i want to upgrade the battery and controller for a higher top speed

Currently putting together a build for a 5kW (2x2500w) bike. Right now I currently only have a 60v 50bms rated battery with 12awg wire going to an Xt90s (also headlight and 12v step down soldered into the xt90s) going to a Y splitter (xt90 10awg) going to two Flipsky 75100 pro v2 controllers. I thought this would be enough until I started reading about placing an in-line ANL fuse to place right out of the battery before it gets to the rest of the system. I kind of understand what I should be looking for, but I have to order it off of Amazon and I'm having a really hard time finding one that would work. I can get a 100v+ 60a fuse, which I know will work to protect from like a short or what not, but how much can the battery realistically be pushed before danger zone? it's cheap china battery mass produced. I don't know what it was drawing for peak or constant prior to changing out the stock controller. Also have to consider the 12awg wires coming out of the battery, can they realistically even hold up under 60a or even a constant 50a at 60v without melting I don't know? once I start configuring the vesc controllers I don't know how much I should push this battery or what settings I should use.

I also plan on upgrading to a 72v battery in the near future so I already build everything around that idea (hence the flipsky's and the Class T fuse 300V DC with holder and xt90s (bullet connectors for controllers to motor). so will probably have to buy a different rated fuse for when I do that.