combine AGM with Lithium in the same battery bank?

good morning.
I am a bit of a novice, trying to upgrade on a shoestring.
anyway, I have a 48 volt system, 8 AGMs, about 3 years old. They have been severely abused and possibly degraded and approaching an early EOL.
I am a pig so I need/want More Battery.
as I recall the modern BMS for the Lithium packs have a similar charge profile and could be compatible.
maybe I am crazy.
thanks for any input and resources.
Peter in Baja
Peter in Baja
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