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Dyson v7 Trigger cordless vacuum - TEARDOWN of battery pack

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Manuel Wald:
Hello,

Thanks for your answer, unfortunately I can't find an IIC in the program, do you have a screenshot for me, thank you.

tinfever:

--- Quote from: Manuel Wald on November 09, 2023, 12:07:05 pm ---Hello,

Thanks for your answer, unfortunately I can't find an IIC in the program, do you have a screenshot for me, thank you.

--- End quote ---

By IIRC I just meant "If I recall correctly".

There is more info here: https://www.eevblog.com/forum/reviews/dyson-v7-trigger-cordless-vacuum-teardown-of-battery-pack/msg4016680/#msg4016680

Make sure you are using the old PicKit3 programmer software as mentioned and that you uncheck the "Program Memory - Enabled" checkbox.

NeilP:
I have posted a new topic on these..not sure if a new topic or tagging on here or another post was the best thing to do ..so opted for a new post.


If any of you ladies and gents have the time , I'd appreciate any input om this

Thank you

https://www.eevblog.com/forum/repair/beginner-dyson-battery-question-sv03-sv05

gold oxide:
I have one of those batteries (Dyson V6, SV3) here. A friend of mine had  already removed the case and pulled the switch from the spring contraption weeks prior (not knowing this will permanently pull the trigger). So the pack to my understanding kept the ┬ÁC awake and switched the mosfet without a load until it went into undervoltage shutdown or some kind of timeout failure mode.

Cells were around 3.45V each when I got it. No LED, no response to the switch or plugging charger. Charged it in series with a bench PSU to 25V and still no reaction at all.

I reset it by removing the (-) tab from the pack and it went into red blink lockout. Just for posterity: Is there any other way to recover the battery from the completely non responisve state without triggering lockout?

Great work on that firmware tinfever, will have to get a PicKit and give it a try.

Manuel Wald:
Thanks for the reply,
I found the checkmark and it works!!! :popcorn:

Now I have two more batteries that I would like to bring to life:

Type SV10 from Dyson V8 vacuum cleaner with 20700 cells, BMS 180207-02/04

When I press the button and apply the magent to the reed switch, the battery flashes blue, approx. 3-5 times.
I then measured all the cells, 3.8-3.9 V, I then connected my balance charger directly to the cells and charged the battery to 4.2 V.
All cells checked with a measuring device, from 4.17-4.2V, internal resistance 25 mOhm. :bullshit:
Flashing blue light still remains... |O

Do you have any tips on how I should proceed?
Please provide feedback, thank you.

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