Thorsten Loesch
Member of the Trade: Studio RaumklanG, Studio Cocktail
If changing them is there any need for battery matching or anything of that nature or do you just buy four new ones and pop them in ?
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The definite answer is maybe.
If you buy genuine mainstream brand cells from a reputable reseller, yes. Batteries get pretty good these days.
Of course if you buy fake "UltraFire" Batteries from Alibaba and the 40 robbers like this:

Here the "original for comparison":

And no, they are not 6,800mAh, more like 1,800mAh.
If you get garbage like this, they may even end up performing a rapid unintentional selfdisassembly while being charged.
I have received fakes from reputable retailers, I could return the fakes. Of course and I have the necessary tester too.
I needed the batteries for my "Master blaster" beachblaster, which houses 6S2P 18650 cells, which has a 2 x 50W Class D amp and Focal 6.5" 2 Way Car drivers, with an ESS DAC behind LDAC Bluetooth.
It took three attempts to get good cells (Samsung). One set had one battery blow up and catch fire while charging.
And those all superficially appeared to be genuine Samsung Cells and all came from highly rated on line shops. So Caveat Emptor.
Thor