Sears has the DieHard 10 amp Manual Battery Charger (71221) on sale for $22 with free in-store pickup only. Charges a variety of 12 volt batteries in 3 to 5 hours.
Retail: $50

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    fxp Ben's cred: 190
    Posted 5:49 am PDT 08/23/14

    I've used Sears and DieHard chargers for years, but they are now crap. Got one lasted a year. It was supposed have protection circuitry which failed and shouldn't have. It seems they've put their money in making them look nice instead of quality internals. You should know 10 amps is not going to jump start your car, its more a battery charger instead. I'd look for something that has a selectable range from trickle charge to at least 25 amps.

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    dave_c Ben's cred: 3751
    Posted 12:14 pm PDT 08/23/14

    This type of linear charger is pretty easy to troubleshoot and repair if it fails. That would usually be from a thermal or regular fuse or diode.

    It is true that 10A isn't remotely close to a jumping current but "IF" your battery is merely drained instead of damaged to the point of not being able to hold a charge, and you have an AC outlet nearby to use this so it's not like you are stranded somewhere, 10A would put a usable amount of power into a battery in less than a half hour.

    Suppose the charging is only 50% efficient, then 30 minutes at 10AH only equals 2.5AH retention, but if you are cranking the vehicle to start for only 8 seconds then [60/8 * 60 * 2.5 = 1125A], if it weren't for the fact that the still depressed voltage results in lower current through the starter windings.

    I use my 10A sump pump battery recharger on a regular basis to charge a battery in a vehicle I seldom use. I also use it to top off a riding mower battery in the middle of winter.

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    Ben's Price
    • DieHard 10 amp Manual Battery Charger $22 at Sears
    • $22
      Retail: $50
    • DieHard 10 amp Manual Battery Charger $25 at Sears
    • $25
      Retail: $50
    • DieHard 10 amp Manual Battery Charger $25 at Sears
    • $25
      Retail: $50
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