configuration of the 52Vx15Ah battery?

[Chazmo]

Hi gang,

I just bought a used 52Vx15Ah Juiced battery as a spare. Does anyone know the cell configuration of these? I think this was the generation of battery that just preceded the 2022 introduction of the “G2” battery. I have the specs for the G2 (52Vx19.2Ah) battery, which has 84 cells (14 serial x 6 parallel), but I don’t have the 15Ah configuration.

By the way, the reason I care is that I want to know if I can trust my charge percentage table… namely, is it 14S5P or is it something else?

I also want to know if it’s the same actual cells that are used in the G2 battery in case I need to do some repair/replace someday.

 

[harryS]

The number of cells in parallel won;t matter. The charge percentage vs voltage is the same. A 52V20AH and 52V5AH will both be 100% at 58.6V and near 50% at 52V. Yes, if the cells are not the same type, there are some small changes, but not important here.

In your case, Juiced is using 3.2Ah cells for the 19.2AH battery. If they used the same cells, a 14x5 array would give 16AH, so they are not the same cells, They could have done a 14x5 with 3.0Ah cells or even a 14x3 with 21700 5Ah cells, You would have to look inside, but I don't think you need to do so,

In my opinion, you won't ever need to replace cells in a quality battery. They will all wear uniformly, If you have a crap battery where a cell fails after a year, it's futile to replace, because another one will go bad soon afterwards. I like to think Juiced made good batteries.

 

[PCeBiker]

,.. it's futile to replace, because another one will go bad soon afterwards.

It can also be Really Dangerous.
Mixing and matching and mismatching cells had a lot to do with the fires in NYC.

 

[Chazmo]

The number of cells in parallel won;t matter. The charge percentage vs voltage is the same. A 52V20AH and 52V5AH will both be 100% at 58.6V and near 50% at 52V. Yes, if the cells are not the same type, there are some small changes, but not important here.

In your case, Juiced is using 3.2Ah cells for the 19.2AH battery. If they used the same cells, a 14x5 array would give 16AH, so they are not the same cells, They could have done a 14x5 with 3.0Ah cells or even a 14x3 with 21700 5Ah cells, You would have to look inside, but I don't think you need to do so,

In my opinion, you won't ever need to replace cells in a quality battery. They will all wear uniformly, If you have a crap battery where a cell fails after a year, it's futile to replace, because another one will go bad soon afterwards. I like to think Juiced made good batteries.

Right, understood, harryS. Although what I was really after was whether they are 14 in series. If they’re a different voltage cell, then I’m not sure that the charge percentage would map because the range might be different.

But good advice anyway, and I hope you’re right that I don’t need to take anything apart over time. And, the 15 vs 16Ah discrepancy does make it seem like they’re not the same cells. I was basically hoping I’d have spare cells in case transplantation became necessary. Although, that’s a fairly dangerous piece of surgery that I probably wouldn’t want to try anyway.

 

[harryS]

36V is 10 cells in series.
48V is 13 cells in series
52V is 14 cells in series.
Series is the S number,

The AH capacity is determined by how many cells in parallel (the P number).
They multiply P by the cell AH to get the total AH for the battery,

Nominal voltage times AH gives you watt-hours. A 52V19.2ah is 998 watt-hour. That's huge, but it's typical to only get 90% of that in real life riding, often less.

I recall Juiced or Rad, one of those sellers, would be conservative and estimate range for a typical rider at 15 WH/mile, but some slower/lighter riders might only use half of that,

 

[Chazmo]

The second battery just arrived and it’s in good condition. Will try riding it tomorrow.

The casing is roughly the same size as my original G2 (19.2Ah) battery on the left so I’ll just have to open it up someday if I really want to see what the actual cell configuration is.

I’m considering whether I can transplant the 15Ah battery into the spare G2 battery assembly that I have from the battery that burned… (see https://forums.electricbikereview.com/threads/psa-warning-about-juiced-battery-casing.57337/ ). I would like to have the handle and AirTag from the G2 battery on the 15Ah battery. But, the cover plates front and back are not the same on both batteries.

 

[Chazmo]

This battery chart was sent to me, and I think it was from Juiced (not sure). The chart lists 15.6Ah rather than 15Ah (which is on the battery’s label). That could indicate actual measured values rather than theoretical, but it doesn’t illuminate whether the cells used are the same between this and the G2 battery.

Anyway, 800Wh is terrific for a backup and range extender and it fits perfectly on my bike which is the important thing for me.

 

[harryS]

The Juiced chart seems reasonable.