The WFCO website has manuals for model series only, not individual models - - i.e. "8900 series" but not "8955PEC-GE".
I don't know but suspect that the GE designation means that GE circuit breakers are used in that model - - but I am frequently wrong
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At any rate, the "lithium ready" sticker doesn't mean much if they didn't put a lithium ready power center in the TT. And they didn't. See attached photo of spec page of manuals. Your power center is only for LA or AGM.
For WFCO, at least, to be lithium compatible, it must have that LiS designation at the end of the model number.