Will it charge a dead battery? I recently bought a $50 Shumacher charger from Walmart which would not charge. A jump start did.
451223
I an not sure it should, I ended up buying a Stanley from Wal mart that has a dedicated battery reconditioner selection
451224
i have 2 batterys in my boat 1 keeps a charge pretty good other dosent it was almost dead and charged it up will take a charge but still dosent hold it this charger dose charge it up and maintains it
451225
depends on the condition of the battery. if it has 2 or less volts it will take along time to recover it.
609216
Probably won't charge and its dead. Mine had charging problems which is why I sent it back.
229972
No... but if you are talking about a battery that had the lights left on overnight and 'dead' it will not charge if it is below (I think 2 volts) some minimum voltage left in the battery. It IS very frustrating because the older 'not so smart' chargers would at least try to charge a dead battery where these smart ones won't work at all. I faked one out once by connecting a small motorcycle battery to my dead car battery and fooled the 'smart charger' to start working and then put the motorcycle battery back. Battery was fine after about 6-8 hours of charging.
2004736
Please forgive my ignorance Arthur. I purchased this to trickle charge my Optima Batteries. I am not sure if you can jump start, but you would need to have it plugged in. There is no battery in the unit. Very light.
2219682
If you look at specs on this charger it is fully automatic, amps are limited, so yes if the battery can be charged this one will do the job. If the battery has a dead cell then nothing works.
229974
I guess you have to define completely dead. Will it charge a battery that has been completely drained overnight by leaving an accessory on? Yes, matter of fact it has a automatic De-calcify mode that helps make batteries last longer. Will it charge an 8 year old battery that died because of below zero temps? no, no battery charger will.
2163296
It depends on what you are jump starting. If it is a diesel with glow plugs, be aware that when you are using the high current tap, the charger is putting out about 17 volts and canburn up glow plugs if you turn them on while at this voltage. It will charge the battery just fine.You may need to replace the clamps on the end of the charging cables. They are pretty poor quality, but other than that, it should work just fine.
376446
Completely dead? If it is broken (dead) no, ... otherwise if the battery is completely depleted it will work. This has happened to me a few times. It also recharges very rapidly, ... about 2 hours for a full charge.
1193781
Put the battery on the charger ang charge it for a couple of hours. Put the battery back on the drill. If the drill runs faster that it used to be then the charger is working and the battery is about dead. If there is no noticeable difference in speed then the charger is bad.
770535
The wattage of this unit is too low to charge a completely dead battery. It will only maintain a battery that is already charge,preventing your battery from getting drained even when parked for sometime.
2130875
it is a balance charger but if you have a cell that became discharged below minimal voltage then its not going to fix that. However if the battery just got discharged unevenly somehow, it may recharge it to full capacity. I am guessing that the battery developed a short and is probably defective, but trying another charger may fix it (if it was not discharged too far). Just be extra careful when trying to charge that battery and monitor it. Hope this helps you to decide what to do! It is a good little charger for the money!
1324949
a fully dead battery might have other problems, like shorted cells, or something else that might affect it's ability take a full charge. But as far as the battery charger goes it should charge overnight, it's best i've ever had
243003
If the battery pack isn't powered up then the charger is shot. Start with a drained battery for this test, then test it out under a load after charging.Hope This helps.
119866
If it is a 12 volt battery this charger should work fine. I would start the charger for about 7-8 minutes at 40 amps, then turn it down to 10 amps for about 3 hrs. The 40 amp rate is to sort of shock the battery, then a slow charge for the next 3 hrs. If the battery doesn't show taking a charge after the 7-8 minute 40 amp charge, it might be bad. You could turn it up to the 200 amp charge for about 30 seconds, then turn to 40 amps to see if it is charging. If it is, after the 7-8 minute charge, then turn it to 10 amps.
452632
The polarity is correct. This unit will not charge a dead battery. It only outputs enough power to maintain a charged one. You will need a plug-in style charger that outputs about 14 volts at approx. 2 amps for 6 hours or so, then test the battery. Charge it at a low rate to try to revive it. If it comes back and holds charge, it should read about 12.8 volts fully charged.
916583
From our experience this charger may recharge a battery if it still has a little life in it. It will not recharge a completely dead battery.
1501919
If you have the older charger, and buy a new battery it will not work....they have added an additional slot on the new battery, so you will need to buy a new charger. I hope this helps.