Dewalt drill batteries not charging update.

If your brave, take it apart and measure the voltage across every individual cell. Chances are one or more are defective in some way.

Bob

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You simply connect the voltmeter leads to each cells positive and negative. If you are saying you can't access the positive contact since the interconnection is too short (most times these are simply folded over and can be unfolded to gain access), then measure from the negative case on one battery to the negative case on the next since the positive should be directly connected to it.

A fully charged (good) cell will measure approximately 1.2V. Bad (shorted or leaking) cells will measure zero or close to it. Find out how much Batteries Plus charges for the cells and for spot welding on the solderable leads and then compare this to their rebuild price to determine which alternative to take.

You also can look on the Internet for a cheaper source, but you take your chances when doing this on quality.

Bob

The Dewalt batteries currently made today have screw together cases to make it easy to get inside them. Older Dewalt batteries had a sonically welded cases you'd have to carefully cut open with a hacksaw or Dremel.

I fixed a Dewalt battery charger for a friend a couple of months ago. It had a shorted diode (the bad one had obvious burn marks on the pc board). I used an NTE 5809 to replace the original one. BTW you'll need a Tamperproof Torx T-10 to open the case to access the pc board.

2). The case of each cell is minus or negative. So measure from case of the first cell to the case of the next cell will give you one cell voltage. You don't need to break it open unless you can't get to the cases. Which are in plastic sleeves. Puncture the sleeve and connect to the case.

Or just bite the bullet and p> x-no-archive:yes

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I'm surprised that no one has mentioned anything about these nicads being so discharged that they act as if they will never take a charge again. I have had several packs and separate batteries act this way.

I just put them in and out of the charger, then rest a while, then start again until finally it got a tiny charged forced upon it. Then it would accept a normal charge.