18v makita lit/ion battery?

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April 2020

You did not say and I did not realise in my previous answer - that your batteries might not be official Makita manufacture - if your batteries are third-party ones they may have slightly different dimensions on the contacts.

Continuing Good Luck...
April 2016

Mine work fine but they're not used professionally - just as hobby DIY tools.

The tools have three contact strips - Plus & Minus 25 mm long and a third 3 mm connector that must I suppose act as a safety interlock - the ON switch.

My guess is that this short contact is the one that's causing your problem - not always making a connection.

You might try to eliminate the culprit - is it the battery pack or is it the tool? Do you have other tools that work OK or other batteries that do not give problems.

I am convinced based on what you say that there's a failure of the interlock connector - not making a good connection - might it be corroded? You might clean it a bit with sandpaper.

Good Luck...
April 2016