How many hours on those?
Yes a bad battery will cause heat buildup, blown fuse. Are your SB connector pins soldered in? If you changed them, they must be soldered as heat will build up and fuses will blow. On any AC drive machines, the crimps on any cables need solder, or factory replacement type ones.
what does the battery read "at rest" vs what does the battery read under hydraulic stall < 3 seconds time.
10% or more drop in voltage = bad battery