Results 1 to 3 of 3

Thread: Test charging of L-ion battery that won't take a charge

  1. #1
    Join Date
    Nov 2006
    Location
    Oak Harbor Washington on Whidbey Island
    Posts
    3,134

    Test charging of L-ion battery that won't take a charge

    I have 2 18 volt Ryobi L-ion batteries same age 1 takes a charge the other doesn't.

    In a earlier thread it was mentioned that when a battery gets so low the charger won't charge it but if it is charged slightly the sensor in the charger may then pick up the trace current & charge the battery.

    Well I am trying this idea out. I taped a long screw in contact with 1 terminal & a short screw in contact with the other so that the clamps from the charger would be spaced apart I reinforced the electrical tape holding the screws with a thick rubber band. So far the light on the battery is now indicating that there is some current in the cells. I am using a battery trickle charger that I use to keep my Bobcat battery up over the winter it senses the battery charge & turns off & on the sustain the proper charge on the battery. If this works it will make me very happy .
    "Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
    "If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart

  2. #2
    Join Date
    Nov 2006
    Location
    Austin, Texas
    Posts
    1,448
    Sounds like a logical idea, but I would be really careful - If a Lithium Ion battery gets cranky, it simply catches fire. Ask the owners of the grounded Boeing Dreamliners. Ask the people who had a computer battery fail (I had two subject to manufacturer recall for overheating).
    Charlie Plesums, Austin Texas
    (Retired early to become a custom furnituremaker)
    Lots of my free advice at www.solowoodworker.com

  3. #3
    Join Date
    Oct 2009
    Location
    Dennison, MN
    Posts
    512
    Quote Originally Posted by Charlie Plesums View Post
    Sounds like a logical idea, but I would be really careful - If a Lithium Ion battery gets cranky, it simply catches fire. Ask the owners of the grounded Boeing Dreamliners. Ask the people who had a computer battery fail (I had two subject to manufacturer recall for overheating).

    Charlie is 100% correct. Modern batteries are basically dangerous when they are out of spec. Li-ion isn't super bad, but when you start getting into Li-Po and Li-Fe batteries they can explode with little to no warning. Especially the hard cased tool batteries. With the stuff I use for R/C, the batteries will get "puffy" when they are taking a crap on you, can't tell with tools.

    Most of the new batteries when the voltage drops too low, they are junk and are no longer charge-able. Most of the time there is a cut out in whatever the tool is that will shut it down once the cells are too low in voltage.

    For me, I wouldn't do it. Well, I'd do it in the shop, because its insured and I need a career change. :lol: But, being homeless from a fire would suck.
    "Do, or do not. There is no try."
    -Yoda



Similar Threads

  1. Charging Station
    By Darren Wright in forum Flatwork Project Showcase
    Replies: 9
    Last Post: 02-29-2016, 03:48 PM
  2. What Would You Charge?
    By Stuart Ablett in forum Carpentry and Construction
    Replies: 34
    Last Post: 03-07-2014, 03:23 PM
  3. How much do we charge?
    By larry merlau in forum General Woodworking Q&A
    Replies: 52
    Last Post: 10-29-2008, 12:09 PM
  4. Timers for battery charging stations...
    By Jim O'Dell in forum Off Topic Discussion
    Replies: 12
    Last Post: 12-28-2006, 02:19 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •