My BTP (for lead acid) does 14.6 for 4-5 hrs, then drops to 13.3, then slowly drops to 12.9 if and when the day heats up to 100 degs. On a 75 deg day, it stays at 13.2-3.
I din't know there was a BT for Gell battery only, nor would I ever want one.
Neither did I know of a gel cell MC battery,.....AGM....VR SLA, yes.
http://www.batterystuff.com/kb/articles/battery-articles/gel-vs-agm.html
Rich
'01 31' Rexall Vision, Generac 5.5k, 1000 watt Honda, PD 9245 conv, 300 watts Solar, 150 watt inv, 2 Cos 6v batts, ammeters, led voltmeters all over the place, KD/sat, 2 Oly Cat heaters w/ ox, and towing a 2012 Liberty, Lowe bass boat, or a Kawi Mule.