MEXICOWANDERER wrote:
"Even if it isn't perfect", would be like having a 5 lb fire extinguisher filled to 8 oz and calling it "Not Perfect". Or a 3-axle motorhome with a 15 gallon gas tank.
Yes a smart charger will replace most of the depleted charge. Unlike a gas tank, batteries are snotty chemical laboratories. They'll sulfate then lattice link the crystals. When that happens you can push the little "Desulfate" button 100,000,000 times and the battery will just laugh at you. There are two remedies: Don't boondock a lot, and put your battery store on speed-dial.
While I agree the typical portable smart charger is not the best to charge a battery and then put the battery in storage. I think the idea is to charge the battery due to some mishap and put the battery back in service to be charged by the normal operating system such as the alternator.
The portable charger is not typically designed to be the primary charging system. If it has battery clamps... that is temporary use only.
More like carrying a few extra jerry cans to get you through a tight spot but not to fill the tank each week.