DIYbanter - View Single Post - Need reliable 7.4 volt replacement battery pack for discontinued device.

mike[_22_]

On 9/12/2018 2:56 PM, wrote:
On Wed, 12 Sep 2018 14:20:30 -0700 (PDT), wrote:

Do 18650 cells have built in protection or not?

mark
Some do and some don't. You need to look at the specs when ordering.
Eric

Also note that protected cells are slightly longer and won't
always fit. If you don't have a tab welder, soldering to tabs
might produce a package that won't fit.

It's easy to find protected cells on ebay. There might be a vendor
using quality cells and tested protection, but you won't be able
to tell from the ad. I wouldn't buy any lithium cells on ebay.
Everybody lies...some just do it more convincingly.

Never, ever touch a lithium battery that belongs to someone else.
It is NOT worth the risk. Low risk, but unlimited liability.
Are we feeling lucky?

Having said that, I do unrecommended things with lithium batteries
all the time. But I would NEVER let anybody else get near the result.
The sound of an exploding battery and battery goo on your safety glasses
is an experience you never forget.