Is this battery protected? - 18650

[MrBaz]

I don't think they are, but it's worth a shot.

I pulled these out of an old Dell laptop battery. They are 18650's.

The covering is a light green, and this is the only text:

MOLI FSPE.70028.059094
ICR 18650 MADE IN CANADA

They are about 65mm long. 18mm in diameter.

 

[turbodog]

Not likely because of 2 reasons.

1. laptop batteries (or most any assembled "pack") have the protection on the entire array in the form of an external curcuit.

2. an 18650 is 65mm long. the protection circuit goes on the end making it longer, and you're isn't longer. expect a protection circuit to add 2-3 mm in length.

 

[Neg2LED]

The length thing...the cells are manufactured a tiny but shorter to accommodate the protection....


Take one cell, and place your fingernail flat so that each side of the finger points to either negative or positive, and rotate the cell. if you find a little metal band running up the cell, then it's probably protected.

If you look at the heatshrink on the negative end, then if it's protected the shrink will buckle in and out 2-3mm from the end.

Post a photo of a side view and i'll take a look.

But turbodog's first point is quite valid, and means there is a 90% chance the cells are unprotected - the pack usually has a pack-protection circuit with multiple cell taps that also handles charging.

--neg