FYI Not all DME's understand Permobil chairs support 34s and 24s but the 24s have to be flattops vs standard post.
I've been using MK group 24s for over a decade, always been very happy with them. The last pair I got does perhaps not hold a charge as long. HOWEVER I have not had these batteries for very long, and sometimes there is a break-in period of a few months. So, I'm not sure much can be inferred from my experience.