![]() Perhaps you do not have to meet them exactly to get good service from them, but the closer you can come to meeting them, the better. Ignore them at the expense of your wallet. When the manufacturer recommends a certain charging profile that is outside other AGM specs, or FLA specs, it is for a reason. Many will say you do not need a special charger for AGM. I think any reports of poor performance/ lifespan from Sears DHP or Odyssey are largely user induced by not meeting the rather extreme recharging currents recommended by the manufacturer. The Odyssey tech said at least two discharges and recharges at 0.4C would be required to bring an improperly charged battery back up to its maximum remaining capacity/ energy density. It had to be cycled and recharged at 0.4C for it to hold the 13.0 rested OCV. Before cycling it this deeply and recharging it at 0.4C, it would not rest above 12.8 from alternator or solar the first three days after purchase. However I have taken it down to 40%, and recharged it at 0.4C, held 14.65 for 4 hours, and 7+ hours after removal from charger the battery was still at 13 volts. I do have a charger which can meet the 0.4C for a 90 amp hour battery, but I am not sure I am going to cycle this battery often. These also have similar charging requirements when cycled deeply. I did acquire a Northstar AGM battery as my Engine battery. I did not feel I could properly recharge an Odyssey/DHP in my application. I do not have a charger able to meet 0.4c for the capacity I was considering My alternator can meet 40 amps at 14.7, but I don't drive for 4 hours straight very often I was mainly concerned about my 200 watts of solar not being able to even come close to this number for one battery, much less the 3 I was considering. I asked about a not so deeply cycled battery, and he said they still require this charging regimen for maximum lifespan and performance during that lifespan. Not meeting these rather high charge currents on a deeply cycled battery will never allow the battery to reach full recharge.* Once 40 amps brings the battery upto 14.7V, the charger is to hold the battery at 14.7 for 4 hours, then drop back to 13.7 float voltage. 0.4C, or 40 amps for a hundred amp hour battery. When deeply cycled, they want a very high recharge rate. What I called the tech about was the recharging requirements. The marine versions have both the automotive posts and threaded studs. ![]() I talked with length with an Odyssey tech, who did confirm that there are no internal differences between SEars DHP and Odyssey.
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