Question about Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451

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Battery charger just flashes to say the battery has to cool down but will not start charging.tried another charger same thing happens but does not show that the batteries are faulty!

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  • anglia64 Apr 04, 2009

    Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451. Every thing was working fine and then boyh batteries would not charge, 2 flashing lights on charger. Help is it the charger or batteries. the drill is little used and 15 months old.Help to neilweatherald@hotmail.com please



  • olsenfix May 22, 2009

    I have the same proble with one of my two barreties. Have only charged it a few times.

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Unfortunately, Makita’s li-ion battery packs have a design flaw. After having the same problem with my two batteries, I took it apart and saw the problem immediately. You see each battery pack has ten li-ion battery cells and a circuit board with a memory chip witch holds the charging history of the battery pack. But that memory chip constantly draws power from 2 of the 10 batteries. The current it draws is very small but if you consider it over 6 month or more, the power drain becomes very significant. You end up with a battery pack with 8 still fully charged battery cells and 2 drained battery cells. When you put this battery pack in the charger, it detects weak battery cells, assumes they are defective and refuses to charge. To avoid this problem you should charge your battery pack often, even if you haven't used it, every two months should be ok.
I suspect that Makita doesn’t make these battery packs, they make power tools, good ones too. But Makita should definitely have a few words with their supplier before they become a liability!

Posted on May 27, 2009

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