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Hello, I'm currently very busy with work and have little time to dedicate to the battery. At the moment, I have the BMS disassembled. The next step is to disassemble the cell pack to extract the temperature and voltage sensors. Once I have all the components, I need to disassemble the bike to...

We now have the 750 powertube battery ready to be disassembled; the first challenges lie ahead.

With the best current cells, you could reach 396 Wh, and the other option with semi-solid cells would be to try to fit two sets of 8.3 Ah cells, measuring 7x50x130 mm and weighing 100 g each, into that space to achieve a 597 Wh battery. But the available space is very limited to fit all those...

The first step would be to know the battery's dimensions, how much free space is left inside the frame, and if possible, the next step would be to open the battery and see, as the colleague mentioned, which cells it contains. With that data, we could see if simply changing the cell model would...

Thank you so much for the information, it's invaluable to me right now. I did find a cheap 750Wh battery, but a 600Wh one would surely have been even cheaper. And now, knowing that capacity changes are possible, it's a bit easier for anyone wanting to replicate the experiment.

Changing the cells isn't a problem since the BMS has no way of knowing where the voltage is coming from. As you probably know, in Spain there are extender manufacturers who connect their extender inside the battery before the BMS for it to work. We already know that neither the Bosch BMS nor the...

I don't manufacture batteries professionally; it's just a hobby. This post is for sharing knowledge so we can all contribute to the common good. The next step, for example, is uncharted territory for me: the internal components of a Bosch battery and its BMS. If anyone has experience with this...

The cells have already arrived, so far they meet the promise, the cost of the cells is around €250, transport €200, duties and taxes €150, a used 750 wh battery is €200, here in Spain.

We will do it that way; it seems the most reasonable thing to do.

It seems each user is looking for something different. Stainless steel doesn't seem like a very interesting option in terms of the final weight of the assembly. Second-hand batteries are very affordable; after all, we're only interested in the BMS, and if the cells are degraded, we don't care...

Regarding the cell swelling documented in the technical data sheet, it is after performing cycle tests with a 1C charge and a 3C discharge (which would be equivalent to a constant 2100W motor) for 300 cycles. The tests are done with the cell without its container. This is a very extreme...

The operating range of the lithium cells is 2.6v / 4.2v according to their technical specifications, but the BMS of our batteries only allows them to discharge to 3.0v. This is documented in the previous project in another thread on this forum. If you're curious, check it out and you'll see the...

The core difference is that pouch cells refer to a flexible packaging format, while semi-solid cells describe a newer, safer battery chemistry that typically uses the pouch format. A semi-solid cell is essentially a specialized, high-performance pouch cell. Pouch Cell (General Format) A pouch...

The nominal voltage of the cells and the charging voltages are the same as the lithium cells we intend to replace. The BMS should function without any changes; in fact, it has no way of knowing the voltage source. We simply need to reconnect the voltage sensors for each cell in the series and...

The cell's technical specifications don't mention the need for cell compression; they only state that the cells shouldn't move within the casing. My idea is to create a casing combining 3D printing and carbon fiber layers to prevent movement and make it robust enough to prevent any swelling that...

I've edited the message containing the data sheet with the correct model, and here's what this battery supplier offers.

You're right, I attached the wrong sheet. The correct one has a width of 74, which is just right for the 77 width of the Bosch 800 battery, but it's still workable. Indeed, the fact that it's only a series of 10 batteries and its shape makes it simpler to build and easier to position the weight...

I'd like to enter the debate about the range of different systems with a variable that's often overlooked. In my experience, the performance differences between different motors and their respective methods of gear reduction and clutch operation aren't as significant as they might seem. The...

Hoja de datos de las celdas

These cells are the best we currently have available for manufacturing e-bike batteries. From what I've seen, products offering higher energy density drastically reduce battery life with each charge cycle; they seem designed for war, I can't think of any other purpose. It seems we're finally...