DIYbanter - View Single Post

Brian Reay[_6_]

On 22/09/2018 18:51, wrote:
Hi all,

I have a few 18v Graco (same as DeWalt lithium ion) batteries for my paint sprayer which seem to charge well but then die very quickly. Once charged they show just over 20v on the multi meter. I have been doing some searching and come across people saying
1. Zap them with 36v - although this seems to be if they are not charging at all
2. Slowly drain them until tool doesn't work any more. Leave them and drain again. Repeat until completely dead and then charge.

Does anyone know if this works or is there a better option? For option 2, my sprayer only has one setting so will this have the same effect or do I need to find another way to discharge them eg somehow find a 18v ish bulb ?

Thanks in advance for your help

Lee.

Those techniques are recommended by some for NiCd (and sometimes NiMH)
cells/batteries. I'd not try them on Li cells- especially the zapping
one.

Generally, if an Li cell is dead, it is done for.

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