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I switched from lead to lithium on a 2020 Vegas 27.7. I contacted WFCO and Battleborn and they said about the same - the WFCO 8900 can charge lithium but not to the full capacity of the lithium batteries - they both said numbers around 85 to 90%. I think more importantly, the WFCO 8900 does not get the lithiums to the voltage where the built-in controller equalizes the cells. This can lead to degradation of the batteries. Battleborn said a work around is to take a portable charger designed for lithium and use it on the batteries once a month or so to allow the lithiums to equalize. I decided to change out the WFCO internals - installed WFCO WF-8950L2-MBA. It was $225 from Camping World but shop around. Taking my time and not having opened up the breaker panel and charger before, it took about 45 minutes. You remove a few screws and take off and replace 4 or 5 or 6 wires. There are some Youtube videos and the written directions were good.
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