Replacing a UPS that got fried during a storm, was Lithium the right choice?

I pulled the pin on a smallish Eaton 3000VA/2700W 9PX3000RT-L (was the only one in the channel in Canada) UPS with an addon battery pack from a cabinet. Now I am second guessing myself. Anyone else move to the new Lithium battery USPes and then wonder if you're ever going to be able to replace them post-warranty without taking it up the arse and not being able to use non OEM for half the price?

We got a little over 16 years (and 4-5 battery replacements) out of the Tripplite that died. Wonder how long we'll get out of this Eaton?