I found that the Group 51 battery the came standard in my 2013 CR-V E-XL w/Nav was marginally sufficient. The other day I went to start it in 12 deg. F weather and it definitely turned over slower. Also, last summer I was playing the audio system while I was drying the CR-V (30 min) and there was not enough power left in the battery to start the engine.
After looking the existing battery and mounting hardware, I decided that there was enough room to mount a Group 24 size battery which is only slightly longer but considerably wider than the stock Group 51.
I purchased an Exide FP-AGM24F along with a battery base and cover for a 2013 Honda Odyssey. The stock battery hold-down clamp actually fits the new battery better.
Today I decided to test the new battery capacity with headlights on and stereo playing for an hour. The engine turned over quickly. I'm a happy camper!
Stock battery rating - 410 CCA (cold cranking amps)
New battery rating - 710 CCA
New battery base
New battery installed