Question about Makita 18V LXT Lithium - Ion Cordless Impact Driver Kit Model BTD140

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I have a makita lithium battery/charger problem.my batteries are 2 yrs old and the charger is fairley new.the problem is that sometimes the batteries charge just fine and other times the charger will just sit there and blink 2 green lights at me. i don't know if the problem is the bats. or charger??? what do you think??? has makita been having any issues with these items??? thanks for your help!!

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All lithium ion batteries lose 5-10 percent of capacity per month, regardless of usage. always check manufactures date on batteries when buying because 3 years is a long lived lithium ion. the price you pay for a fast charge with awsome power and little weight.

Posted on Oct 10, 2009

  • Toolmon Oct 23, 2011

    On my charger, the green blinks when no battery is inserted, so perhaps you have dirty contacts. But two greens? I don't know the meaning of that.

    Lithium batteries do lose capacity permanently at about 20% per year, depending on the chemistry of the battery (these are Sony lithium manganese batteries and that's about right for them). The batteries are rated 2400 mah when new, and Makita just rates them as 1500 mah to allow for some aging. In the bigger 1830 battery the cells are paralleled, so they are 4800mah when new, and degrade 20% per year. After five years, they have lost a lot of capacity and you might want to get new ones.

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There seem to be a bunch of people with crapped out  Makita 1815 batteries.
A very naughty way to fix them is to buy another one, replace the innards with your dud innards and return it. Technically this is fraud, but if they sell dud batteries.... what can you do?
It is worth keeping your receipts as it seems alot of these batteries are going bad quite soon after purchase.
Matt

Posted on Aug 18, 2009

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Battery has to be cool before you put in charger,also check contacts for dirt etc..cheers

Posted on Mar 03, 2009

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