I opened up a cheap RapidX $199(AU$279) LIFEPO4 - photos

Pieter Blackie · Jan 18, 2022

Well it was easy to open up only a small bit of the lid was actually glued on, I found a couple of wires pinched and the the rest is self explanatory in the photos ...
I cant believe that I had these batteries connected in Series running a 2400w inverter off them, I drew 50A for more than 30 minutes quite e few times but was mostly running at 5A to 15A.

meetyg · Jan 19, 2022

Nasty build with all that soldering... ouch.

MachOne · Jan 25, 2022

Thanks for the photos! I can see why they were so cheap. You were lucky to get away with series connection. Here's the BMS on Ali https://www.aliexpress.com/item/1005003026098951.html

meetyg · Jan 25, 2022

Some more thoughts and questions about this battery:
1. From the pictures I can't see any temp sensors. Did you find any ?
2. Did you do a capacity test?
3. Pretty strange that they put a 50A BMS for a 100Ah battery (maybe the capacity test will tell us otherwise). But at least it's a JBD.
4. All that solder is ugly, but I really don't understand their build: They made a custom PCB, laser welded the connector to the terminals on the lid. Maybe solder is cheap, but it takes more time to do (which is also money). The custom PCB is also worth a few pennies... Maybe the money they saved on the BMS went for other things.

ocular · Jan 25, 2022

yeah, a capacity test maybe revealing. Never feel comfortable if can't see each cell voltage.

Bud Martin · Jan 25, 2022

BTW, does the spec on the sticker show Max Discharging Current: 50A?
The spec I found indicating 50A Max discharge.

Sharky722 · Jan 25, 2022

Pieter Blackie said:
Well it was easy to open up only a small bit of the lid was actually glued on, I found a couple of wires pinched and the the rest is self explanatory in the photos ...
I cant believe that I had these batteries connected in Series running a 2400w inverter off them, I drew 50A for more than 30 minutes quite e few times but was mostly running at 5A to 15A.

View attachment 80332

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I pulled my one apart also.
They are used 60ah cells with some life left in them.
My capacity test was 115ah.

Abyss · Jan 5, 2023

Do you reckon these are the same as the Everglow 100ah that look pretty much the same?
I have two and want to upgrade the BMS so I can run them in series, wondering if I should buy two new 4S series BMS, like a JBD as it would drop in, or a new case and a single 8S BMS?! I cap tested them both at just over 100ah btw

oldmaninsaline · Jan 5, 2023

That ain't nothing. At least your BMS looked nicely mounted. Mine were crooked. What really gets me is that these things actually work as advertised.

Check out this soldering job.

Sharky722 · Jan 5, 2023

oldmaninsaline said:
That ain't nothing. At least your BMS looked nicely mounted. Mine were crooked. What really gets me is that these things actually work as advertised.

Check out this soldering job.

View attachment 128051

Is that a rapidX 100ah one?

oldmaninsaline · Jan 6, 2023

Sharky722 said:
Is that a rapidX 100ah one?

No, it's the famous "Screampower" batteries. Ordered 2, got one with pouch cells, one with prismatic, both with different BMSs. In the end, didn't matter, they play well together.

SparkyJJO · Jan 6, 2023

oldmaninsaline said:
No, it's the famous "Screampower" batteries. Ordered 2, got one with pouch cells, one with prismatic, both with different BMSs. In the end, didn't matter, they play well together.

Seeing that, I understand the "scream" part. Yikes.

1ram · Jan 6, 2023

oldmaninsaline said:
That ain't nothing. At least your BMS looked nicely mounted. Mine were crooked. What really gets me is that these things actually work as advertised.

Check out this soldering job.

View attachment 128051

It's like toddlers learning how to "color inside the lines"

oldmaninsaline · Jan 7, 2023

SparkyJJO said:
Seeing that, I understand the "scream" part. Yikes.

But it puts out over rated capacity so I just use eye bleach after glancing at it.

Alkaline · Jan 7, 2023

That is nothing... look at this guy:

Looks like he didn't learn his lesson so he goes and buys a new one:

24v 300AH that actually are 24v 60AH.

Bluedog225 · Jan 7, 2023

That’s some quality stuff.

Alkaline · Jan 10, 2023

Some German guy got scammed as well, 120AH on a claimed 200AH battery

Bud Martin · Jan 10, 2023

Alkaline said:
That is nothing... look at this guy:

Looks like he didn't learn his lesson so he goes and buys a new one:

24v 300AH that actually are 24v 60AH.

I know! and now he is complaining about not having luck getting his money back.

oldmaninsaline · Jan 12, 2023

Alkaline said:
That is nothing... look at this guy:
Looks like he didn't learn his lesson so he goes and buys a new one:
24v 300AH that actually are 24v 60AH.

In the case of ScreamPower, their customer support is far, far better than I would expect. In fact, after I blew up the original BMS (blewed it up real good with magic smoke and everything), they sent me a new one for free but they used counterfeit postage so I had to pay 8 bucks in postage. Worst soldering job ever but it works fine.

These Chinese companies are a laugh a minute.

I opened up a cheap RapidX $199(AU$279) LIFEPO4 - photos

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