Checking hybrid cells/modules gen3 ‘13 P-V 132k mi.

Live in KC. My hybrid battery pack is acting funky: sometimes shows 7/8 bars (on both dash and car app, ENERGY) then more recently 3-4/8 bars. Guessing, after 11 years, some cells need “re’d”: refurbished, rebalanced or replaced. Oddly, I tried a simple test: drove it up to 65-70mph for a few miles to see if bars reduced from base of then 6/8; just opposite happened - monitors showed 7/8! Know anyone in KC doing this? Thanks for replies!