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Read the findings of our research below.
The sheer volume of emails and calls about this battery together with the dozens of faulty ones being off-loaded on eBay has prompted us to look in solutions for the repair and recelling of this model.
As it stands testimony from the contact I have had states the battery does not last more than 50 - 60 charge cycles (if you are lucky!)
Makita make some quality tools so don't get me wrong but they have over-engineered this battery to the point it self-destructs.
The battery is made up of two components a bank of Li-Ion cells and a Printed circuit board (PCB).
The cells are self explanatory the purpose of the PCB in most Li-Ion batteries is to protect against overcharging, overheating and deep discharging all of which damage Li-Ion cells and can cause them to become hazardous.
Makita have designed this battery with all these features plus more, there is a microchip which will monitor how many charge cycles the battery has had and constantly collect data from it. Futuristic stuff if a little over the top. The intelligent circuit will also detect a faulty battery and after 3 failed charging attempts it will disable the battery permanently. Now this is a safety first approach and if you look up the dangers of Li-ion batteries you will see why.
Here is where it all goes wrong.
The intelligent circuit inside the pack needs to be powered, and it draws its power from the very cells it is monitoring.
The basic design flaw is that the circuit is wired to be powered by only one of the many cells in the pack. The PCB draws a constant although small current from that single cell. If the battery is not used for a few weeks then that cell will deep discharge causing a weak link in the bank of cells, the pack then fails in the charger.
Now who is to know that if they try to charge the battery 3 times in this state they will permanently disable it? Human nature is think, why is it not charging let me try again.
So if you use your tools every day you might have been lucky enough to have avoided this by charging them regularly.
Where do we stand
We are no longer researching the repair of these batteries, replica replacements are the cheapest easiest route to get your tools up and running.
Please see the summary above for conclusion of research.
Tel: 020 8099 6030
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