Anyone know of a better replacement
Yes -- take it to a professional repair technician. But start by putting in a NEW battery -- you'd be surprised how often people ignore problems caused by this.
Apologies, but IME most people assume that all guitars come from a world where there's universal drop-in replacements for every part AND that anyone with a screwdriver can do it in five minutes. Easiest (of course) are solid-body electrics, & I've bought a few quite cheaply after the owners rendered them unplayable.
Acoustic-bodied guitars are more difficult than that to "home mod" with any success.
Unless you have previousl installed or replaced a piezo-saddle pickup system, I wish to warn you that it's quite easy to do more damage. As in: you might go from having one bad saddle to making the entire circuit useless.
The only production basses I've ever seen to use a similar piezo bridge system were the Parker Fly Mojo & the Ibanez EDA, both apparently with the Fishman Mono-Rail II (a.k.a. Ibanez Gibraltar) bridge units. I have never seen these for sale on the open market. They seem to have been dicontinued years ago in any case.
On the EDA, each saddle has its own little "trim pot" adjustment accessible through holes in the back cover, so that the string-to-string sound can be balanced. The AB45 seems to have such holes. If you didn't know that already, you SHOULD NOT be doing anything MORE complicated.