Battery Source

[mroper]

Does anyone have a source for these type of batteries. I think they are Lithium Polymer. I tried a part no search got nothing. You can see this one is puffy.

 

[Axxe55]

What type of device does it go to?

 

[glenbo]

https://www.aliexpress.com/i/32874907807.html

Amazon has something similar

 

[Brains]

Lithium cells are ~3.7V, with packs being multiples of that. Start there, and search for cells/packs that will physically fit your application. The only kicker is if you have a "smart" pack with embedded electronics (temp/charge monitoring or what have you), you may need to perform some additional surgery.

 

[mroper]

What type of device does it go to?

It is one of those Bar Battery Jumper power packs . It takes three of these. I know it might be cheaper to buy a new one but I wanted to see.

 

[TreyG-20]

How many amp/hr? Possibly a hobbie shop for R/C stuff.

 

[mroper]

Lithium cells are ~3.7V, with packs being multiples of that. Start there, and search for cells/packs that will physically fit your application. The only kicker is if you have a "smart" pack with embedded electronics (temp/charge monitoring or what have you), you may need to perform some additional surgery.

So school me. It states it has 18000Mah do I need three 6000 Mah or three 18000Mah (well 18000 is the claim on the package)

 

[ffrokix]

Be aware that messing with Li-ion cells can be quite dangerous. Think "explosion and fire". Be sure you install them correctly -- no polarity reversals or other miswiring, and not even momentary short-circuits. You should take the old ones to batteries plus or similar place for disposal. I say old ones because you have to replace all of them, preferably with matched cells.

If the old one says 18000 mAH, that's what you need. It also has to be a physical fit. It seems you struck out searching for the part number, but try again. You can replace it by duplicating the form factor and capacity, but you absolutely have to know the chemistry. Guessing can get you the explosion and fire.

Depending on the onboard controller, you might find that it is DOA even with new cells. This is because the protection firmware detects very low cell voltage and kills the pack (for safety reasons, and it's no joke), typically by blowing a fuse and entering the permanent failure state, wherein it will refuse to charge or discharge. So there's a risk just buying new cells. If you hadn't already removed the cell, there is a procedure you could have followed to avoid letting the applied cell voltage go to zero.

The owner's manual might call out the behavior of the pack at failure. Often there's a display code. Before I ordered new cells I would reconnect the one you have (I assume it has > about 2.5 volts) and see what indications you get. If it's anything like a permanent failure, you're out of luck.

I wrote firmware for these things for 20 years, and I would scrap the old one and get a whole new unit.

 

[Younggun]

So school me. It states it has 18000Mah do I need three 6000 Mah or three 18000Mah (well 18000 is the claim on the package)

Is this for one of those charging packs for phones and tablets, or one of the small vehicle jumpy start packs?

The post above is correct about the need for special protections on LiPo for charging and discharging. That does look like a LiPo cell though.

Wildly guessing without enough info, you would want a 3 cell 18000mah pack to replace it. Each cell would be 18000mah. Honestly don’t think that would be all that common to find. And depending on what it’s meant to charge you need to make sure they have an adequate C rating.


Really need more info about what it’s used in though.

 

[Brains]

So school me. It states it has 18000Mah do I need three 6000 Mah or three 18000Mah (well 18000 is the claim on the package)

If they are wired in series, you're adding voltage (+[battery]- --> +[battery]- --> +[battery]-). So three 18Ah in series would total 18Ah @ 11.1V

If they are wired in parallel, you're adding amperage (All + wired together, all - wired together). Three 18Ah in parallel would total 54Ah @ 3.7V

You can tell very quickly by putting a volt meter on the pack, it should still have power. If it's a fair bit over 3.7V, the packs are in series.

Another option is instead of using flat cells, you can convert over to "standard" cells. You can make a pack of something like an 18650 in a series/parallel arrangement to get the voltage and capacity needed. That's what Tesla does for their packs. So you could take 8 cells wired in parallel to make a 20Ah 3.7V pack. Then take three of those packs and wire them in series to achieve a 20Ah 11.1V pack. You can adjust the number of cells up or down as space allows, and choose cells based on capacity vs. price.

 

[mroper]

I think I will just buy another one of those car jumpers and recycle these batteries. Pro tip: Don't store it in your HOT car over the summer.
I thought it would be simple to find the batteries Like I did for my car camera.