Thanks Swoop223

Called around locally (Atlanta) for the WP45 battery and was told:
A) Scrap it since SLA are a waste of money in that type of machine.
B) Go to Wally World and get 2 marine batteries and a charger.
C) Install 4 wet batteries but he was not sure if the on-board charger will care.

Best I can find is the UB62000 for $210.00 online shipped.

The WP45 only has 500hrs on it.

I can buy the Yale for $500 as is.

That is why I was thinking about putting the battery pack into the WP45 since that is cheaper than new batteries.

To clarify, the warehouse staff tells me the Yale never needed any water to be added to the batteries in over a year when they would check it.

I have equipment repair skills but no experience on this type nor any battery testing tools. I've lived without a walkie jack for 15 years but figured the pricing was OK for a non-daily use machine.

I was there the day the Yale tech had his laptop plugged into it what seemed like hours. After that, the machine was condemned. That warehouse bought an exact replacement the next week. Go figure....