The thing that concerns me about any Lithium is it construction type.
Some deep cycle lithiums use a batch of cylindrical cells in a mix of series and parallel to get the desired AH and voltage. Others use pouch cells in the same manner. They both have their uses i.e. torches or SDC2300 and Mobile phones respectively, all low voltage and mAh rated.
The only type of construction I would chose is prismatic, as it, in my opinion, is more robust. Both mechanically for bouncing around in a 4by or caravan and electrically for higher loads.
My Companion 40 AH PLB does not state construction type and most don't. The interesting spec difference between it and my Pylontech (which is prismatic) is;
Companion 40AH = 2,000 cycles @ 80% depth - Pylontech 100AH = 4,000 cycles @ 80% depth. Methinks definitely a different construction.
The other difference is the price per AH;
Companion Rover 40 AH = $535 @ $13.38/ AH - Pylontech 100 AH $985 @ $9.85/ AH. To extrapolate using the cycle life also, the Rover works out to $26.76 or near 3 times the price. Which shows that convenience really is more expensive lol.
Bottom line, if a manufacturer doesn't specify cell construction, I'm not interested.