244CEC2-AA-S5: 24 Volt-4 Amp Aviation Calibrated for Concorde ONLY Aviation Battery Charger, Battery Maintainer, and Battery Desulfator

Does exactly what it's supposed to do...safely charges and maintains an aircraft battery. Instructions are clear and easy to use.

I have Concorde battery in my Bonanza that was getting a bit tired and seemed like it was losing some energy density with age. New batteries were way backordered so I decided to give this unit a try to see if the claims of desulfating would worked.I left the battery tender on the plane for about 3 weeks and it has made a big difference. Cranking the big continental is no problem and the battery shows no sign of struggling with the starter as it had before I used the Battery Minder.I'm sold!

I bought this to replace an older batteryminder (one with buttons you had to press to start charging). The old one claimed two of my old 24V Concord RG24-11M batteries were weak. This one charged and desulphated them but did not say they were weak. Hopefully that is because it did a better job of rejuvenating them. (I keep the old ones around and charged in case the current one goes dead suddenly.)

Great charger. States it can be left plugged in and charging continuously, but there is some data suggesting that intermittent use prolongs battery life. I have elected to place an outdoor timer inline to turn on the charger three times a week for 12 hours charging of my Concord aircraft battery.

I had a batteryminder for my Concorde since 2010 and it became faulty a few weeks ago. I found this one with a charger and it works great!

Love it, keeps my plane charged.

Purchased the battery adapter kits and a Y connector from the OEM (one for each battery). BatteryMINDer now connects through the luggage compartment.

I read it and called..... read and told that if my battery would hold above 24.6 volts for 24 hours it was recoverable. Mine held 25.4 for three days. Said to be patient for three weeks or so and I would have an 85% battery. Had high hopes but it did not work and it is now past return date. An expensive mistake. Had to buy an new $835 battery. I am now using to maintain that a new battery that did not need attention but can't return it so I might as well.Said it would make my battery last for years. I doubt it