Battery.
May 17, 2021 12:55:56 #
BebuLamar wrote:
Well recelling the cordless drill battery isn't very good idea as the cells are not that much cheaper.
I can't find any available so I can check the price. : (
May 17, 2021 13:52:25 #
jerryc41 wrote:
I can't find any available so I can check the price. : (
Google 18650 Li-Ion. For example the battery pack I disassembled last week was a Milwaukee M18 XC 5.0. I think the price is about $120. It has 10 Li-Ion 18650 cells rated at 2500mAh each. These cells I think are selling for average $10 each.
May 17, 2021 16:16:00 #
NMGal wrote:
They look like double A’s.
They are probably the larger size 18650 Lithium Ion cells...
May 17, 2021 16:18:04 #
jerryc41 wrote:
I can't find any available so I can check the price. : (
The problem isn't the price... it is balancing the starting voltage of each cell to every other cell. If you buy a set for replacement, be sure they are a matched set.
May 17, 2021 16:20:05 #
burkphoto wrote:
The problem isn't the price... it is balancing the starting voltage of each cell to every other cell. If you buy a set for replacement, be sure they are a matched set.
If they are the same model they should be the same or close enough. The charge could be different but if that the case simply charge each of them separately before assemble them in the pack.
May 17, 2021 16:23:35 #
chrissybabe
Loc: New Zealand
The cells in a camera battery like the Nikon's ARE NOT 18650 !!!!
They are too long to fit. One of the features of the 18650 is NOT the ability to squeeze themselves into a smaller space. See my earlier reply re this. Do you not read other entries here before spouting off on your own ?
This is how misinformation spreads !
However Teslas and powertool batteries ARE 18650's. It is generally uneconomical to completely recell a tool battery however often only 1 or a pair of cells have failed and these can be replaced provided you make sure to preferably use cells of the same capacity as the original (not essential but they must be at least the same or higher rating).
And they must be high current cells. A lot of 18650's will not allow you to drag the current from them that is required. Batteries used for vaping will allow that (although watch for crappy material which doesn't spot weld well). The best source of cells is often other battery packs which have failed, dismantle them, remove the spots where they have been previously welded and test them. Discard the cells which fail to test well and use the others for repairs. So if you dismantle a name brand drill pack that is rated at say 4Ah it will contain (hopefully - see below) batteries rated at 3.5-4Ah and high current draw. Test them all. If the pack contained 10 cells you will either get 10 cells good (other electronics in the pack have failed) or find perhaps 2 cells failed but the rest are good. These cells can be used to repair other 4Ah packs. Watch for brand X packs as they can contain far more failed cells or even have been made up of cells far less rated than the 4Ah used in this example. Some clones may only contain 2Ah cells as there are a lot of dishonest people out there who rely on ignorant users never bothering to test a whole pack. Once you have a known source of good cells you can generally find the bad cells in a complete pack by testing the cell pairs. One pair will probably measure very low compared with the others. Carefully peel them out and spot weld in a new pair. DO NOT SOLDER them in. Also check for cells which have dribbled (or leaked). It might not be possible to repair if it is really bad.
They are too long to fit. One of the features of the 18650 is NOT the ability to squeeze themselves into a smaller space. See my earlier reply re this. Do you not read other entries here before spouting off on your own ?
This is how misinformation spreads !
However Teslas and powertool batteries ARE 18650's. It is generally uneconomical to completely recell a tool battery however often only 1 or a pair of cells have failed and these can be replaced provided you make sure to preferably use cells of the same capacity as the original (not essential but they must be at least the same or higher rating).
And they must be high current cells. A lot of 18650's will not allow you to drag the current from them that is required. Batteries used for vaping will allow that (although watch for crappy material which doesn't spot weld well). The best source of cells is often other battery packs which have failed, dismantle them, remove the spots where they have been previously welded and test them. Discard the cells which fail to test well and use the others for repairs. So if you dismantle a name brand drill pack that is rated at say 4Ah it will contain (hopefully - see below) batteries rated at 3.5-4Ah and high current draw. Test them all. If the pack contained 10 cells you will either get 10 cells good (other electronics in the pack have failed) or find perhaps 2 cells failed but the rest are good. These cells can be used to repair other 4Ah packs. Watch for brand X packs as they can contain far more failed cells or even have been made up of cells far less rated than the 4Ah used in this example. Some clones may only contain 2Ah cells as there are a lot of dishonest people out there who rely on ignorant users never bothering to test a whole pack. Once you have a known source of good cells you can generally find the bad cells in a complete pack by testing the cell pairs. One pair will probably measure very low compared with the others. Carefully peel them out and spot weld in a new pair. DO NOT SOLDER them in. Also check for cells which have dribbled (or leaked). It might not be possible to repair if it is really bad.
May 17, 2021 17:06:10 #
Don.Y wrote:
They are 48.5mm long x 18mm in diameter.
Those are dimensions of size 18500 cells. 3.7V, 1400 mAh is typical (5.18 Wh).
May 18, 2021 00:43:41 #
Brian in Whitby
Loc: Whitby, Ontario, Canada
Don.Y wrote:
Inside a relatively modern camera battery.
Most battery packs photographic or otherwise are built from smaller cells. Wireless phone batteries (Not smart phone batteries are often just a couple of Nickel metal hydride AA cells soldered together in series. If you have even a nodding acquaintance with a soldering iron you can rebuild one for a fraction the cost of buying a replacement.
May 18, 2021 14:43:14 #
I've opened one of the cells with a hacksaw. There were sparks & a black goo oozed out. There didn't seem to be smaller cells inside the cell - it just looked like the one cell.
May 18, 2021 15:12:12 #
Don.Y wrote:
I've opened one of the cells with a hacksaw. There were sparks & a black goo oozed out. There didn't seem to be smaller cells inside the cell - it just looked like the one cell.
No we didn't think there is smaller cell inside. Just that we thought they were 18650 which is longer than your battery. I think yours are 18500 or 18450.
May 18, 2021 15:48:51 #
chrissybabe
Loc: New Zealand
While you are at it why don't you go buy a stick of dynamite and cut that open to see if there are smaller sticks inside ? Presumably you have heard of all these phones whose batteries catch on fire and cause all sorts of strife. Exactly the same thing can happen with camera batteries if they are mistreated since the battery has the same chemistry. Keep clear of the goo. It can make a mess of your hands and any painted surfaces it touchs. Do you have all your fingers ? If so I am surprised.
May 18, 2021 16:01:17 #
chrissybabe wrote:
While you are at it why don't you go buy a stick of dynamite and cut that open to see if there are smaller sticks inside ? Presumably you have heard of all these phones whose batteries catch on fire and cause all sorts of strife. Exactly the same thing can happen with camera batteries if they are mistreated since the battery has the same chemistry. Keep clear of the goo. It can make a mess of your hands and any painted surfaces it touchs. Do you have all your fingers ? If so I am surprised.
He’s lucky it didn’t start a flash fire.
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