The 7Ah one doesn't almost get drained on one inflate/deflate cycle on my 2.8m Zodiac.
It will easily do two cycles, and l've done three without it going flat. The Bravo pump draws about 10 Amps and will inflate the boat in five minutes.
I've had the battery four years and it's still OK, (somebody said these batteries don't last long when used in this way)
However if there's a 12 Ah battery then why not l suppose, the extra capacity won't do any harm particularly if you have two boats to inflate.