Batteries won't charge w/ on board charging unit.

Your problem states you have a Makita tool and your question is about a Dewalt lithium battery. In either case if the battery won't take a charge or if the charger is showing the battery is defective the only fix is to replace the battery. Some causes for defective batteries or batteries that won't take a charge are bad cells in the battery, bad or shorted IC board in hte battery, broken or burnt connections between the many cells or between the cells and IC board or even bad or old cells that will no longer charge up. The time and effort needed to find out what the problem is then finding another battery to scavenge parts from (individual battery parts are not available) is never worth the cost of just buying another battery and going back to work with the tool(s).

Digital camera batteries are usually with an external battery charger.
The charger maybe faulty, the charge adapter will have a LED indicator to indicate that it is charging.

If the recharageable battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up at all. OR Thebattery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time. If the battery drops to anunacceptable charge level then the battery needs to be replaced.

Batteries don't always look degraded but if they've been in use for a while or have a bad cell, they will show up bad on the charger and it won't charge them. The only way to test the batteries is to try to charge them on another charger. If the batteries show defective on another charger, they are bad and you'll have to replace them. Also try to charge some batteries you know to be good on your charger to see if it's the problem. If your batteries charge on another charger, your current charger is bad and they don't have any replaceable parts in them so you'd be looking at replacing it.

Hello

First, make sure your batteries are rechargeable. But even rechargeable batteries have a lifespan, try charging it into another charger. If it is charging on another charger, then that means your charger is faulty. If it won't charge on another charger, then the batteries are dead, and you need to buy new set of batteries.

I leave my 18 volt batteries charging year round even if I do not use my drill I switch batteries about once a month to keep them both up to snuff. your new chargers are made to do that unless the instructions tell you not to. I was told even new batteries will not hold their charge if allowed to completely run down and stay there.

my chair jazzy 1113 ats won't move.all the lights are flashing and the batteries are fully charged why are they flasng

Its unusual for a charger that was working to stop working because you replaced the batteries. Does your chair operate correctly with the new batteries? If so then I would check the connection of the on-board charger at the controller box located in the front base section ahead of the batteries. Trace the cable from the charger to the controller and make sure it didn't come unplugged from the controller. Your red light on the charger would still light up but you would never charge the batteries. Now if you can locate an off board charger (borrow from a friend or neighbor that has one or borrow one from your local provider) plug it in the charger port located under the front of the joystick and see if the batteries will get fully charged that way. If you can't find any cable problems with the on-board charger and the off-board charger charges the batteries then there is a problem with the on-board charger or the charging system through the controller. It would be cheaper to purchase an off-board charger if the borrowed one works than try to replace the on-board charger. Hope this helps

rechargeable batteries are definitely a better bet. I have used many Wii battery packs and chargers, none seem to last very long.

try replacing the battery fuse

Li-Ion batteries cannot be charged efficiently with power supplies or NiCad chargers, they need a pulse charger dedicated to Li-Ion batteries. Also, there is a danger in charging with other sources as Li-Ion batts. will catch fire or explode if not charged properly. Please get a charger that is made for those batteries