Super Jet Battery Issue, won't charge?? AGM?

[jjk8]

My battery died at the lake the other day. Put a new battery in and tested voltage before and after starting, voltage remained the same. Assumed there was a problem with the charging system. My buddy is a mechanic at a pwc shop and is particularly familiar with the superjet. He checked everything, the stator and all components in the e-box and found nothing wrong, he did this 3 times. The two batteries I had were Duralast Gold AGM batteries, neither battery would take a charge while the ski is running. We finally threw in a WPS yb16cl(I think that’s the number), just a regular lead battery and it would take a charge, voltage jumped up while the ski was running. We tried another regular battery non AGM or whatever they are called and it took a charge as well...

My question, is there an issue with AGM batteries taking a charge in these machines?? If not, any thoughts??

 

[Byeai]

No I have six agm batterys from advance auto and they run perfect

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[jjk8]

I just tried both batteries in my waverunner as well with the same results.. I had them tested at the auto store and they tested good but needs a charge. One of these batteries is brand new never used and the other one was new and lasted about 6 rides before it died. Seems really odd but I guess they could both be bad.