Author Topic: T15+3 Battery Replacement  (Read 793 times)

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Offline Axeyard

  • Posts: 17
T15+3 Battery Replacement
« on: November 21, 2021, 08:27 PM »
I can't import Festool products to Japan, but found this one on AliExpress:

https://www.aliexpress.com/item/1005002704792491.html?spm=a2g0o.cart.0.0.ab233c00QMV7ku&mp=1

It doesn't have the 3 contacts on top, unlike a genuine Festool battery.
What do you think, folks?

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Offline Bob D.

  • Posts: 2389
Re: T15+3 Battery Replacement
« Reply #1 on: November 21, 2021, 09:51 PM »
I have a T15+3. I bought it new from Woodcraft about 5 years ago IIRC.

I have wondered what I would do if both batteries died as they are well
beyond warranty. I wasn't even aware Festool still sold 15V tools and
batteries, but they're are out there which works in my favor as far as
getting a replacement battery goes.


Sorry you can't get Festool parts in Japan.
-----
It's a table saw, do you know where your fingers are?

Offline Coen

  • Posts: 1195
Re: T15+3 Battery Replacement
« Reply #2 on: November 21, 2021, 09:51 PM »
That is a NiMH battery. If your tools are compatible with the Lithium batteries... don't bother with NiMH.

You might look at refurbishing your current battery if it failed. That is like 8 new 18650's and some spot welding.

Offline Alex

  • Posts: 7740
Re: T15+3 Battery Replacement
« Reply #3 on: November 21, 2021, 11:47 PM »
Be very aware of anything you buy from those Chinese sites like AliExpress. Don't be surprised if you're not getting what you thought you would get.

Festool still makes 15 volt batteries, I bought 3 brand new a few weeks ago from Amazon. My advise is to get in contact with somebody in a country where they are sold and have that person send them to you.

Offline Axeyard

  • Posts: 17
Re: T15+3 Battery Replacement
« Reply #4 on: November 22, 2021, 01:24 AM »
Thanks for all the ideas and info, great advice too.  ;D
I'd never heard of 18650 batteries. I found this info: "18650 batteries are lithium-ion batteries. They get their name from their size: 18mm by 65mm."
Checking the 8 cells in the Festool battery, I measured them at 65 x 18.2 mm, or so.

Edit: Wow, these things are really tight in there, in those plastic clips. Replacement might not be quite as easy as I'd imagined. Also, the 18650s that I see on Amazon Japan have the projecting positive terminals, like regular AA batteries. Not as stable as the flat terminals on both ends of the Festool cells. Tricky soldering job too.

In case anyone would like to see the inside of the battery, I took a few pics for reference:


« Last Edit: November 22, 2021, 02:00 AM by Axeyard »

Offline Coen

  • Posts: 1195
Re: T15+3 Battery Replacement
« Reply #5 on: November 22, 2021, 11:26 AM »
Haha, they used an 18V shell for a the 15V battery? darn.   :-X Straight out the window with the space savings of not going 18V.

Yeah, for rebuilding packs you most likely need the flattop cells. And a battery spotwelder, no soldering.

But if you had to search what 18650 was then I suggest you don't attempt this as these cells can cause seriously bodily harm and fire if mistreated.
« Last Edit: November 22, 2021, 11:31 AM by Coen »

Offline Axeyard

  • Posts: 17
Re: T15+3 Battery Replacement
« Reply #6 on: November 24, 2021, 05:23 AM »
Good advice all 'round. Much appreciated.
Bottom line is that I have to let both of my Festool drills go. I don't think I ever even used the angle attachment, which was probably the main reason for buying the T15+3 in the first place. [unsure].
I thought these batteries would last longer though. I have some AA and AAA batteries that are older and they still charge and work okay.
In recent years, I bought a bunch of Hitachi and Makita drills that seem just as good as Festool. I can drill for dowels all day on a single charge. So cheap that I could buy 2 drills for the price of a single Festool T15+3 battery!
Thanks for the education, folks, most helpful.

Offline Coen

  • Posts: 1195
Re: T15+3 Battery Replacement
« Reply #7 on: November 24, 2021, 11:49 AM »
Are they completely death? Some can be 'revived'. I got a free Bosch 18V 4Ah "death" battery. I put 4A charge on it, telling my charger it was a NiMH battery and after two minutes it came back up from 0.4V to 13V and I put it on the Bosch 18V charger and it charged up to about 70% of new capacity.  [tongue]

Offline Alex

  • Posts: 7740
Re: T15+3 Battery Replacement
« Reply #8 on: November 24, 2021, 01:51 PM »
I thought these batteries would last longer though.

My drill is from 2008 and I still use the original batteries. Good for a full day of work, but then they must be charged. Another pair from 2010 is also still working.