makita charger DC1414T

[MCKDAVID]

know we have a good few makita owners on here, so thought I'd ask a wee bit of a service. Customer brought in a 14.4V makita drill, (model 6281D) with 2 dead batteries not holding charge, or even running after coming off the charger...

Realise it's not really a realistic / economic repair, but she wants to try as it's hardly been used, so spent a few minutes on it. Battery charger is my cause for concern, it's putting out 23V on charge. I tried charging a battery to see, and the 14.4V batteries are rising to 18.5V off load. The voltage decays quicky, but then seems stable around 14v, so maybe more an over charging issue, they may already be cooked, but who knows. They're little used, spotlessly clean, agreed that doesn't necessarily mean anything..
I would have expected around 15-16V for charging, but certainly not 23V, but before I definitely condemm the charger as quilty, could someone with the same charger throw a multimeter on it to see what the output voltage is?

I no longer have anything makita, so as usual any help would be much apreciated...

Any thoughts..

 

[Hood]

Is it this type charger?
If so what pins? because it looks like you are between the one shown in my pic and the one opposite. If so I get 0.04v

 

[MCKDAVID]

thanks mate, similar, aye, not exactly, but same style.

checked all the pins, 4 off, across the + / - I get 23V, across the others basically nothing, any combination, somewhere around 0.04V. 23 Just seems too high, I would expect a few volts over, but not that much. I checked my milwaukee 18V and it's at 19.5V offload, which would make sense to me...

 

[Hood]

I get nothing between the pins mentioned and about +5v or -5v between other combinations

 

[MCKDAVID]

interesting, it's possible it needs a load to see the right voltage too.... I'm trying offload obviously.. Also don't know what electronics are in the batteries for the other pins? some sort of overvolts protection maybe?

 

[Hood]

Aye I think it must need the others connected to get it charging, sounds to me like yours is knackered as I know mine works as it is charging a battery right now.

 

[MCKDAVID]

aye, thinking the same, strange both the batteries were screwed, that's what pointed me to the common point, charger. In anycase it's not an economic repâir, new charger and battery, cost more than a new one now... will see what she reckons on monday.

thanks for your help mate..

 

[Hood]

I will double check once the battery has charged and see if that makes a difference, unlikely but you never know.

You can get knockoff chargers and batteries for not too much money but newer brushless drills are far superior so might be best for her to just upgrade anyway.

 

[Hood]

Ok battery charged and tested again.
I get 0v (more or less) between the two pins in the middle.
Between middle and outer pins I get 4.8v or 3.3v and polarity obviously depends on direction of probes.

 

[MCKDAVID]

Aye looks knackered.....

 

[MCKDAVID]

ok, thanks for your assistance, battery charger guilty as charged scrap... will speak to her on monday, but looking like it's for the recycle bin.... had a quick look for batteries and charger costs, even knock off's it's just not worth the bother.. for the same money, she can get a mid range 18v cheapy with 2 batteries, and 2 years guarantee....best option especially if it's for the same use this one has had.

ach well the throwaway society wins again... shame really.

 

[Hood]

It just makes sense sometimes. I have a friend who refused to throw away his fire extinguishers for his boat and preferred to get them serviced instead of buying new, new ones were considerably cheaper than the service but he wouldn't bow to the throw away doctrine

 

[fnlvder]

I have a 6280D drill and a DC1414F charger, I get 5v across both sets of contacts in the charger

 

[MCKDAVID]

It just makes sense sometimes. I have a friend who refused to throw away his fire extinguishers for his boat and preferred to get them serviced instead of buying new, new ones were considerably cheaper than the service but he wouldn't bow to the throw away doctrine

ach, aye your right, makes financial sense, but it sticks in my craw, that it's no worth repairing something that costs pennies to make, but we're happy to make more just to add to the ever increasing junk pile, just makes no sense tae me... but economically you're right..

 

[MCKDAVID]

I have a 6280D drill and a DC1414F charger, I get 5v across both sets of contacts in the charger

perfect; many thanks, aye that confirms what we reckoned, it's the charger that's gone faulty.