Power tool batteries

Chablism

Member
Joined
Jan 27, 2018
Messages
177
I have built up a large number of power tool batteries

A mix of 5 cell, 10 cell and 20 cell

The 100 or so I disassembled for myselfseam to be testing at1200 mAhr

I looked on eBay and there does not seam to be a market for tool battwriesthe same way there is for laptop batteries

The Guys making ebikes want higher capacity

Am I missing a good way to search, or are these high draincells just to low capacity to be of interest?

Tks
 

Riplash

Member
Joined
May 27, 2018
Messages
66
My guess is that you have two things working against your favor. First I imagine most of the e-bikers that buy those types of batteries are DIYers and probably want to make their own packs, and they also are the type that would source their own second hand cells and test the cells themselves.

The second thing working against you is the new high drain 18650s now have a high capacity such as 2500 for Samsung 25R and 3000mAh for Samsung 30Q and they are coming down in price. Earlier this year I was able to buy Samsung 30Q for $3.88 per cell If I bought 40 and the Samsung 25R which is lower mAh but a higher discharge rate for about $3.25 per cell.

Good luck with your projects though,

-Ryan
 

Riplash

Member
Joined
May 27, 2018
Messages
66
I bought about half of them from www.18650batterystore.com. They rotate different cells through deal of the day and I waited for the cells to be on the deal of the day. I bought the other half from Liitokala on Alibaba.com. It has been about 6 months ago, because one I found this website I started collecting second hand cells and those are serving my purpose at the moment.

-Ryan
 

OhmGrown

Member
Joined
Sep 13, 2018
Messages
55
Yeah I think they're just too low capacity to be worth the space in an eBike pack. The high drain aspect has to account for something though and I bet someone somewhere could be interested in that type of market. I'm actually keeping all my drill battery cells separate at the moment to see if maybe I can make a portable power pack for high demand tools, like saws or mixers. Not sure if I'll ever end up using the ones at 1500mAh or lower but the Samsung 30Qs are definitely a good score from those drill batteries.

Incidentally, though I can't speak
for the tools, hitachi seems to exclusively use the Samsung 30Qs in their newer batteries, whereas Ryobi, Black & Decker, Ridgid and the other entry level brands seem to use all kinda different brands and models in theirs. I haven't found any Dewalt, makita or Milwaukees yet but I'm hoping I'll score some of those soon.
 

Geek

Well-known member
Joined
Aug 15, 2017
Messages
934
Chablis_m said:
I have built up a large number of power tool batteries

A mix of 5 cell, 10 cell and 20 cell

The 100 or so I disassembled for myselfseam to be testing at1200 mAhr

I looked on eBay and there does not seam to be a market for tool battwriesthe same way there is for laptop batteries

The Guys making ebikes want higher capacity

Am I missing a good way to search, or are these high draincells just to low capacity to be of interest?

Tks

I have paid $1 each for used power tool batteries, to rebuild packs for my own tools. I don't see a lot of power tool batteries. Definitely try your luck. I bought mine off a fellow in the Marketplace on this forum.

I don't know if he sold any others. That said, if I was building a large pack I would consider using them. A lot easier to open than laptop packs!

People who vape may buy them too.
 

Margusx

New member
Joined
Oct 5, 2018
Messages
1
I just got 4 good makita batterys. vtc3 vtc4 score pretty high i the country where i live is very hard to get something fast done
even is somebody sell old laptop batterys they ask like 5 euros and these are too old to use very bad ones because ppl not replace laptop batterys if its old and still work until ppl buy new laptop. I have to find some other way to get them.

But 3 years powertool battery yeld good score even if you get for 3-5 euros battery pack because makita protection board brick pcb if voltage got bit lower then usual so these new makita versions brick faster ppl reported that these are 1,8-3 years old if you get like 5 year old powertool battery its can yeld bad. I charge these powertool ones 2.5 amps these go bit warm only small difference over body temperature 3Ah ones are 1600mah 4Ah are 2100 or 2200 5Ah ones are 2500+
 

naive

New member
Joined
Oct 6, 2018
Messages
2
My question involves building a battery bank for a solar/wind configuration. I am wondering what is feasible, most cost effective, and long term energy output for a battery bank? How would a Ridgid 18 volt 9 AH ($100.) battery compare to a deep cycle 6 volt 20 AH 75 amp marine battery ($129.)?
 

floydR

Well-known member
Joined
Aug 23, 2017
Messages
1,058
Assuming the Ridgid 18 volt 9 AH batteries are made with 3000 mAH cells in a 5s3p configuration.If the batteries are in a different configuration 5sxp you can increase or decrease the number of cells in parallel. This also assumes the cells are 3.6/3.7 v nominal per cell.
5s=18 volt 7s=24 volt 14s=48 volt
This is just an example your results will vary.
The 18v battery would have to be torn down to be of much use in a solar/wind battery. 18 v doesn't divide into 24v=1.33 batteries, 48 v=2.66. evenly.
cost wise 24v you would need 4 6v batteries so $516 for 24v 20AH.
24v made from 18v rigid batteries 9Ah for 24v 18AH once broken down to individual cells you would need 2.66 18v batteries so 3 x $100 = $300 you could build a 7s6p battery which would in theory would 24v 18AH.
45 cells total 42 cells used in powerwall 3 cells extra
This doesn't include construction cost BMS,etc that goes into building a power wall.
Once you start on the DIY lithium powerwall path it becomes an obsession.
later floyd
Being cost effective depends on a variety of factors.
Do you want/need a battery bank that is plug and play? 6v batteries shorter life cycle, ease of setup, larger selection of inverters.

Too many factors to say if it is cost effective for you.
 

naive

New member
Joined
Oct 6, 2018
Messages
2
floydRThanks FloydR said:
Assuming the Ridgid 18 volt 9 AH batteries are made with 3000 mAH cells in a 5s3p configuration.If the batteries are in a different configuration 5sxp you can increase or decrease the number of cells in parallel. This also assumes the cells are 3.6/3.7 v nominal per cell.
5s=18 volt 7s=24 volt 14s=48 volt
This is just an example your results will vary.
The 18v battery would have to be torn down to be of much use in a solar/wind battery. 18 v doesn't divide into 24v=1.33 batteries, 48 v=2.66. evenly.
cost wise 24v you would need 4 6v batteries so $516 for 24v 20AH.
24v made from 18v rigid batteries 9Ah for 24v 18AH once broken down to individual cells you would need 2.66 18v batteries so 3 x $100 = $300 you could build a 7s6p battery which would in theory would 24v 18AH.
45 cells total 42 cells used in powerwall 3 cells extra
This doesn't include construction cost BMS,etc that goes into building a power wall.
Once you start on the DIY lithium powerwall path it becomes an obsession.
later floyd
Being cost effective depends on a variety of factors.
Do you want/need a battery bank that is plug and play? 6v batteries shorter life cycle, ease of setup, larger selection of inverters.

Too many factors to say if it is cost effective for you.
 

Korishan

Moderator
Staff member
Joined
Jan 7, 2017
Messages
6,418
Naive: Please fix your post. You put your comments "outside" of the quote tags/fields. Most users place their replies below the comment. Also, please preview your posts before posting.
 
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