lispywashrag
1 µW
are there any left at the moment?
[$129 plus shipping, USA BASED] 48v 19.2ah 920wh 60A Li-Ion Battery 3200 mAh cells, 13s6p
- Thread starter AmericanElectricSolutions
- Start date
I bought two last month, but they’re just 15Ah with a 30A BMS. Labels are removed. BMS trips above 35A. There were some small stickers with the same 4815 model number as my other SCUDs.
PM’d seller but no response.
Did anyone get actual 19.2 Ah and 60A BMS? Did it have labels?
It’s not a bad deal if you need 15Ah 30A BMS, but disappointing if you already had two and needed the higher output BMS.
PM’d seller but no response.
Did anyone get actual 19.2 Ah and 60A BMS? Did it have labels?
It’s not a bad deal if you need 15Ah 30A BMS, but disappointing if you already had two and needed the higher output BMS.
Admiralrofl
10 mW
- Joined
- Jan 25, 2022
- Messages
- 27
Even the 19.2ah can’t do 60a. The bms is identical between the 15 and 19.2 ah packs. It’s just the cells that are different. I’ve disassembled both types of packs and confirmed.
And finally, I’ve fully mapped out the bms as i run these batteries in a powerwall system in parallel and had to figure out what I can and can’t do.
It’s a common positive bms design.
The bms cannot protect from charging through the discharge leads. The charge leads (the 2 small ones) have diodes in the positive to stop sparks.
Most people will notice that they will do a full charge on it and the battery will settle into around 53.9v after. Thats EXACTLY how the bms in this is designed. This is supposed to be used in a rental bike so it’s designed for lifespan and durability. The 53.9v correlates to around 4.15v per cell which is a 90% capacity on the cell. Doing this drastically expands lifespan. Same for the voltage cutoff, usually it cuts around 41ish volts as any lower hurts the cells more than necessary.
But it uses a standard 54.6v charger, and yet after the diode impact it should charge and stay at 54.1v right?
That would be correct IF it was using a standard bms but they included passive balance circuitry to keep the cells even which is really important in a pack that is expect to last 5 years or more. So the IC has passive balancing through resistors, and that’s where the excess charge goes, burnt to heat to get it down to an even 4.15v per cell or 53.9v. Unfortunately, this is also why the charging limit is recommended at between 3-4a depending on the model. I’m assuming it’s because of the balancing circuitry.
So I was wrong before, it’s REALLY important to use the charge leads. The bms is really not designed for the packs to be getting up to 4.2v a cell as it is basically fighting super hard to burn off that last bit of power when charging.
Last edited:
Gyppiedread
10 µW
Anyone heard from this guy in a while
Gyppiedread
10 µW
Wow I got 4 batteries one was bad and now I'm getting no reply. Messaged with a different email and he answered quick but still no resolve
BVTTERS808
1 µW
how do we purchase it
BVTTERS808
1 µW
Is it available?
NOTE FROM MOD:
Proceed with caution with this seller. We have seen at least one recent report of an ES buyer receiving a faulty battery (sorry don't know the details), reporting the issue to the seller, and the seller apparently subsequently "ghosting" them. As in not following up or otherwise further communicating.
Sorry this has happened. Looks like this seller has sold many good batteries in the past that the buyers were happy with.
The seller is invited and encouraged to explain their side of the situation.
Proceed with caution with this seller. We have seen at least one recent report of an ES buyer receiving a faulty battery (sorry don't know the details), reporting the issue to the seller, and the seller apparently subsequently "ghosting" them. As in not following up or otherwise further communicating.
Sorry this has happened. Looks like this seller has sold many good batteries in the past that the buyers were happy with.
The seller is invited and encouraged to explain their side of the situation.
Here I will remind everyone of Basic Rules #3 from The rules of Endless Sphere:
3. Do not make false claims against a vendor.
False claims can unnecessarily hurt an honest business, and we don't want to see that.
On the other hand, a legitimately crooked vendor should be exposed; so have a good case before posting it.
Fair, transparent, and noncontroversial.
3. Do not make false claims against a vendor.
False claims can unnecessarily hurt an honest business, and we don't want to see that.
On the other hand, a legitimately crooked vendor should be exposed; so have a good case before posting it.
Fair, transparent, and noncontroversial.
Gyppiedread
10 µW
Not looking good so far...
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