Lipo cell measured 4.3V ?? unpacked from Dyson handheld vacuum

Batteries and Chargers Rechargeable Batteries
1

Hi

I unpacked the battery pack from a Dyson handheld vacuum. It has 6 green cells 18650, I measured them all 4.3V except 1 with a reading of 0.78V. It could be this cell caused the pack no longer chargeable with its charger. Pictures enclosed.

The cell has 2 lines printed on the cover:

- SE US18650VT

  • T 2B12WTE9R

My question is, lipo battery should have a reading of 4.2V and why these cells have a higher voltage ?
Can I use them for my flash light safely ? The cell is 1500 mah.

Thanks!

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2

@ledlight2

Those are Sony 18650 Li-Ion cells, Not lipo.

And you can use them in your light.

Edit:

?Probably these

SONY SE US18650VT T C11 HIGH DRAIN 20A 18650 Lithium Battery

http://www.batterysupports.com/sony-se-us18650vt-t-c11-high-drain-20a-18650-lithium-battery-p-17.html

3

@keengeorge

You are right, they are lion cells and many thanks for the Sony info., it is the exact battery I have.

4

i got the same out of some ECG monitor battery packs (~80?)

nice cells - but i charge them to 4.2 V max

5

@M4D M4X

I charged those cells once and they were all 4.3V , wonder why ?
Other li-on batteries I have can only charged up to 4.2V, I set the charger charges them as li-on with 4.2V max.
I may discharge and charge them again to see how they act.

6

You charged them on a 4.2v charger and they charged to 4.3v? That seems very odd to me. Is your DMM accurate or in need of a new battery?

7

@SIGShooter

Charger and DMM operate OK. I measured them with other voltage meter and the result was the same.
At first I thought Dyson might have used special battery to make the pack but it is Sony brand as keengeorge pointed out.
Will charge it again, haven’t got time to do it.
Thanks

8

Weird…a properly functioning 4.2v charger should only charge to 4.2v even if the battery being charged is 4.2, 4.3, 4.35, etc.