Why does my 36v battery have 28v terminals?

We designed the 28v terminals on the 36v battery to be used specifically for powering your live-imaging sonar module, with an extra 4 amps built into the battery, you can run a live imaging sonar module off of the 28v terminals for 10 hours off of those 4 extra amps, so technically our 60ah battery is 64AH!