Makita 24v battery mystery

[Amp David]

The battery chip, if it has one, will be monitoring temperature and state of charge. I doubt it will be counting number of charging cycles.

Thats what I thought, but took them into the Makita service shop and told me they had reached the maximum number of cycles. He reckoned the chip thingy monitored allo of this

 

[Amp David]

I got fed up with my 24v makita betteries dying so ebayed the drill and bought the bosch 36v li-on

Me too. Only ever used it for 8mm max so just got the new Bosch 18 volt li ion sds. Makes the Makita look like a right pile of turd

 

[Round Man]

Yup, I had this recently, with a fairly new battery. Exactly as you describe, I too thought the charger was goosed. I tried alsorts, completely flattening the bat then trying again, but nope, knackered. Really annoyed about it as the place I got the batt from went bust.

even tho the company u bought from went bust, u should be able to have it repaired if was under warranty, just contact Makita UK and explain to them, as long as u have original receipt and its within warranty all should be well.

 

[davelerave]

both ni-mh batteries died on my 12v bosch drill

as already said-made up of 10 1.2v cells


managed to repair one battery with a bad contact,

the other battery seemed to have a bad cell

 

[Scooter]

Your battery is made up of 20x 4/3a 1.2 volt cells (3.3Ah) OR 20x Sub C 1.2 volt cells (2.0Ah) basically what has happened is at least 2 or more of these idividual cells/batteries has gone down and the other 18 say are fully charged and cant charge any more (hence the green lights), however a drop in 2.4 volts due to the (at least) 2 batteries that are no good means the drill now only has 21 volts to opperate which is not enough, making the "battery" seem flat. My advice, but a multimeter £5, open the battery case up, test across the cells individually, I bet my life at least 2 come back with 0 volts. Remove them from the 'pack' buy a replacement cell (try www.componentshop.co.uk and solder/spot weld the new one back into the pack making 24 volt back up and your drill will work fine. one problem with this tho is you will eventually end up with 20 batteries with mixed age etc. good for a quick fix but ideally your better off just buyin a set of new cells for around £40 ish?? and replacing them all. You can even increase th Ah of your new battery. (all replacements or complete new sets do need to have the same Ah rating as eachother) £40 and a bit of time is a lot cheaper than £150 dont you think????

Cheers Danny, but the link doesn't work. Has that company gone pop or is the address not quite right?

Many thanks

 

[ringer]

try www.component-shop.co.uk (with a hyphen)

 

[dannybruff]

Cheers Danny, but the link doesn't work. Has that company gone pop or is the address not quite right?

Many thanks

yeah sorry the address wasnt right, as ringer said its got a hyphen in it. i knew that already, was just being lazy assuming ppl would google it. soz

 

[wallyking]

Every rechargeable battery has a cycle life, for instant 500cycles, 1000cycles,etc.
Maybe the battery is out of cycles.