Schumacher Electric DSR ProSeries DSR139 Wheeled Manual Timer-Controlled Battery Charger and Jump Starter, 225 Cranking Amps, 6 Volt, 12 Volt, Black, 1 Unit

Best ever for charging. Wish I had bought this sooner. I am now the neighborhood hero.

It does what it is supposed to. It is easy to assembly and easy to use.As stated in other reviews, the ammeter is inop (does not work). Not a big deal to me, but it does that mean that the manufacturer is using lowest bidder suppliers for part? Time will tell.In the meantime it is working just fine in my shop.UPDATE: I am changing my rating from 4 to 5. The ammeter actually does work - once the battery starts to take a charge.

The media could not be loaded. Schumacher customer service is great, once they realize you actually know what you're talking about.My units flash programming mode didn't work out of the box but they got me taken care of. Overall it's a great charger, the desulfate mode works and brought back an AGM battery that was over 10 years old.Update: The flash programming mode works, however the current output is slow to respond and not stable at all. Like if you suddenly remove a load the voltage jumps a substantial amount, if you add a load it drops and is super slow to respond. I've made a video and started an exchange hoping this unit is just defective. I will update my review when I have the replacement unit to compare how they behave. If the replacement unit has the same voltage regulation problem, this will be a huge issue since I've gotten the voltage to jump up above 19 volts while connected to a good fully charged battery! During flash programming you frequently cycle the ignition and fans and lights and other loads can cycle. Just imagine if it dips the voltage as a pcm is initializing, it could brick it. I emailed Schumacher but have not received a response after a few days so I decided to post this review and take them out of the loop.Update #2: The replacement unit arrived which I immediately tested, sure enough it also has voltage swings although not as bad as the first unit. As of right now I am going to recommend avoiding the unit and purchasing something else, a shame really. The unit needs to respond faster to voltage changes, I worry that vehicles that monitor voltage during flashing like BMW might kick you out of the flash due to how long it takes to recover from a voltage drop. I also dislike the fact it has no current display when in flash mode, you have no idea how many amps you're pulling from the unit. I expect more from the DSR series, especially considering the cost of this unit.

Definitely not everybody needs a charger this big. I went this big because I wanted a manual charger besides my smaller "smart” charger. I also wanted one with a 200+ amp, start, setting for doing some battery rejuvenating trials of old batteries (more tinkering), as I have seen done online. This charger had what I was looking for and for its size was very reasonably priced. It does everything I want a battery charger to do. Plus, it is made by a company, Schumacher Electric, that has been in the business for over 70 years so they must be doing something right. I had one of their chargers for over 30 years before something finally broke on it.Too many battery chargers, made today, are so called "smart" chargers. That is fine for people that don't understand battery charging and just want to put the charging cables on a battery and walk away.Being an "Old Guy", I am used to the old "dumb" manual battery chargers and they definitely have advantages that the new "smart" chargers don't have.As far as I know none of the "smart" chargers will charge a completely dead battery that is below 8 or 9 volts. For reference a fully charged 12-volt battery, in good shape fully charged, should measure no less than 12.6 volts. It is considered discharged or "dead" at 10.5 volts. At that voltage a "smart" charger will recognize it and will charge it.But I have had numerous instances where a battery's voltage is too low for a "smart" charger to work. No doubt people have replaced their battery because their "smart" charger wouldn't charge it and they thought the battery was bad. A lot of times all the battery needs is a little boost in voltage, to say 10 volts, so the "smart" charger can "see" it and charge it.Here is where having a "dumb", manual, charger comes into play. Hook the battery up to it first for a while, then put the "smart" charger on it if you want to walk away. Or leave it on the "dumb" charger but you will need to be around to monitor it and should really, at a minimum, have a volt meter to check the voltage. Better yet a volt meter and a battery tester. This is obviously for the "DIYer" as I realize a lot of people don't have the time or aptitude to do this.Being an old retired guy who has tinkered with cars and motorcycles since a kid. I have both the time and the aptitude and I enjoy tinkering.

The bottom was a little stoved in but the legs covered it and the damage didn’t effect the screw holes to put the legs on

Had this for awhile now. Former GM service tech familar with the midtronics GR-8 battery/charging systems diagnostic station. The GR-8 is a 60amp charger along with a bunch of other stuff. This is 50 amps and doesnt care about safety this and that. You turn that knob and amps are going to come out of those clamps and alot of them. Dim your shop lights amount of amps. Reccomend having on a 20 amp breaker. Havent used it heavily but man is it nice being able to charge customers dead batteries in about 2 hours instead of overnight with every other charger ever. Can even use it to function test starters if you know what your doing. Just dont use any more then the 10 amp setting. On 10 amps while connected to a starter on the bench the amps guage needle buries itself beyond 60 amps. Can also use it to maintain *close-ish* to charging voltage with ignition on engine off for testing purposes.The clamps are decent quality and the function knob has a heavy snap action to it. On/off/timer knob feels quality too. It says on the back there is a max 10amp continous 12v charge but when i put it on 50amps it seems to stay on 50 amps but i havent tested on a flat battery yet.

This battery charger is a game changer for me. It will even help jump a 6.0 diesel!

Heavy duty works great