AGMs are lead acid battery too. To differentiate them call regular batteries flooded or wet.
While I have not owned an Odyssey, I have owned Northstar which are also thin plate pure lead and their specs as to CCA and capacity in the same size ranges are almost exactly thee same.
The first one being an older model they reduced in price to move.
While my batteries get deep cycled, and start engines when most depleted, these thin plate pure lead AGMS are best suited for my needs.
While I decided to return the older model and spend the extra for a new one, I noticed the same behavior on both of them. When first put into service, I could not get them charged to the point where they would rest at 13+ volts, until I cycled them deeper and applied 25+ amps until they were fully charged. Once I did that one deep cycle and then 25 amps until 14.7 and hold until amps tapered to 0.45 or less, then they would hold 13.06v, and have that almost violently fast starter cranking ability.
AGMs, when deeply cycled love high amp reharges, and in my experience these TPPL AGMS need the cycle and high amp recharge to maximize their potential.
Odyssey has a pretty good writeup on how they want their batteries recharged. In regular car starting duty one need not worry about the voltages so much, but when one cycles them deeper one needs to heed their recommendations, as they want a 40% charge rate, minimum. 40 amps per 100AH of capacity until the battery reaches 14.7v, then hold 14.7v for 4 hours.
No vehicle will seek and hold these voltages, even if one drives for the 6.5+ hours one would need to fully recharge a battery that was so depleted that a jumpstart was required. Those 6.5 hours assume a high amp source seeking and then holding 14.7v, which no vehicle will do.
So if you cycle the battery deeply intentionally or unintentionally, know that how it is recharged will directly affect how well it performs and for how long.
Being able to hold the 77f degree battery at 14.7v until amps taper to 0.5% of capacity( 0.5 amps per 100Ah of capacity) will be able to negate some of that high amperage requirement when deeply cycled, but it is not as effective as feeding it high amps from its most depleted state until amps taper to 0.5% of capacity or less.
The battery determines how many amps it will accept at a given voltage, and these TPPL AGMs can accept huge numbers when well depleted, and are better off for it, as long as they are not allowed to get too hot doing so.
All lead acid batteries require full recharges for maximum longevity, but AGMS are even more finicky in this department, and since they are a premium priced battery, it makes more sense to heed their recommendations, as their greater price does not make them immune from chronic undercharging, it just mnakes them more likely to respond to an attempt to restore capacity with a charging source capable of doing so.http://www.odysseybattery.com/documents/US-ODY-TM.pdf