tinfever
commented
9 months ago The inductance of the jumper leads you are adding might be slowing down the vacuum inrush current enough to avoid the brown out of the ISL chip. Although, usually the brown out issue only occurs when the cells have a high ESR so the voltage dips too much, or if the load is a direct short circuit.
In the EEVBlog forum thread, and I think in another github issue here, I've discussed where you can try adding a capacitor on the control board to ride through the voltage drop during startup, and someone has tested it and found that to work. I should really only be applicable to high ESR (usually worn) cells though. You might use a scope to watch the voltage on those points and see if you are getting a large supply voltage dip going to the ISL chip during startup, and then maybe work from there. I'd double check your cells though.
dickeos
Please can someone help me understand the issue I have come across, its making me go crazy!
I have replaced all the cells in an ageing SV03 battery pack (with Sony equivalents), flashed the pack with the tinfever firmware, done a power cycle and all appeared great, like I have done several times before with other packs I have refurbished.
I then put the pack back together and connected it to the V6, pulled the trigger and got 16 red lights. I then opened the pack back up and used jumper leads to hook it up the the V6 from the battery terminals and it works perfectly. I have reduced the length of the jumper leads down to as small as I can and it still works, but when I plug the battery directly into the V6 I get the red lights.
Now I know 16 means a brown out so I checked and double checked for a short on the terminals and there isnt.
I have no idea what it could be, its feels like its proximity thing but common sense tells me it cant be.