Recent content by ltosolini

Hello, my e-scooter is based on 20s 40AH LiFePO4 prismatic cells and I charge it at 5A. I have an overcharging protection which I designed which is based on a relais between the battery and the charger which disconnects as soon as 1 cell reaches 3.6V. Unfortunately the relais contact kind of...

my e-scooter is based on 20s 40AH LiFePO4 prismatic cells. Currently I charge it in the garage and so the external charger is very close with ~50cm cord. But I am moving to a new place with not possibility to have electricity in the garage, so I am thinking to keep the charger in the house and...

Agree: better to connect the device in need directly to the output of the inverter. I still need your advice about the connector type between scooter battery main leads and inverter input. Requirements are: - safe so that the side connected to battery doesn't expose live wire - easy to attach to...

I have a e-scooter fed on 20S LiFePO4 40Ah battery pack. I am thinking to use such power as a backup in case my house suffers from power outage from the grid. To do that I need: - a safe and easily accessible connector on the scooter connected to the battery main lead for 72V - a converter from...

Winston LiFeYPO4 Battery are supposed to be particularly resistant at low temp thanks to yttrium. I have no objective data to prove it though, just reading from their website

@999zip999 What is a battery nanny?

Today I experienced an interesting phenomenon.... My e-scooter is powered by a mix of Winston 40ah and Wina 50ah LiFePO4 cells in a 20s configuration. I had a ~15km ride then I parked the scooter for the night at close to freezing temperature; then today I picked up the scooter and checked cell...

Anyway even after this bad experience I am still convinced that it is better without BMS. Lets say that I destryed this cell, this is 60 Euro but I managed to get home safe and fast with my scooter even with this single cell at 0 Volt. If I had the BMS, the scooter would had stopped in the...

So I removed immediately the cell that went down to 0 Volt; it is a wina lifepo4 50ah. It is also swelling. I managed to resuscitate it and so I charged it 10ah which is 20% of capacity and it held the charge for 1 week then it went down to 2.7Volt. Then I tried a full charge and I could push...

Today I badly screwed up.... No BMS and overestimated my pack charge! On the way home I was noticing lack of thrust in my scooter powered by 20s LiFePO4. As soon as I reached home, I measured that one cell was 0 Volt, this is a cell I knew it was the weakest link. Immediately I put the pack on...

Today I put my idea to a test connecting the super-capacitor in parallel to the battery main leads: it didn't make any difference. So the problem is that when I ride, especially during acceleration or deceleration, the individual voltmeters that I have on every cell randomly show abnormally low...

This substance doesnt smell and in some places it is christallized looking like cane sugar. So consensus is for a leak. The cell is still performing well. Do you think there is any security concern? I dont have BMS but rule out any overcharge because I have developed a system that cut off...

Experts, on my e-scooter I have connected a cell-checker on every battery which give me real-time voltage reading. At times during acceleration, but also deceleration, they give very low reading, kind of unrealistic such as 2.6V, but only for one sample and then go back to normal. I suspect this...

Experts, it has been one year since I put version 2 of my Elettra2500 e-scooter on the road and now I have decided to open it for a thorough check-up. All looks good apart from a greasy orange dirt on the top of one of the Winston 40ah cell. Do you have any idea of what it can be? And above all...

My mad! I made a typo in my first post: where I typed 2.28 I meant 3.28, 2.30 -> 3.30 The voltage reading is accurate, I measured with a second meter cell #14 and measurements are ok: 3.30 Volt idle and 3.6+ Volt under charge. This morning I gave it another try: - started with idle cell #14 @...