OK, wow!
Over a year and I’m just getting to update on my PC545 battery.
So, it was 12 years old. Just about as much as you can expect.
I replaced with a NOCO Lithium of approximately the same physical size.
I’ve had no issues at all with the NOCO. Starts right now! Even after sitting all winter.
I would recommend this battery as a good option, not inexpensive though.