Laptop pulls,....what do I have??

I destroyed 2 Dell laptop battery packs today,

Pack one was well used and a couple of years old. It contained 6 light purple cells marked CGP18650 E. Two of the cells voltage was 1.5v. the other 4 cells measured 2.49v. These pack has been sitting uncharged for 8-12 months,…should I keep them or trash them?

Pack two was an unopened new pack, office lady ordered wrong pack and never returned it said I could have it! :bigsmile: It contained 6 pink unmarked cells, there voltage ranged from 3.88v-3.93v,…I was surprised the voltage was so high as this pack has been in a desk draw for almost a year. All 6 are currently on charge but I would like to know more about the cells.

A quick guess, the lilac are Panasonic, pink are Samsung. Are they really CGP?

Pink sounds like LG, but photos and markings would help enormously.

The 2.49V cells might be OK.

I am sorry,….they are CGR18650 E!!!

The pink have no marking to speak of,…solid pink! I can make out some blue ink on the positive end of some of the batteries but I think it is different numbers on each battery?

I thought so! :smiley:

Do you have a hobby charger? If so, test the cells from the first pack within an ammo case or something similar that can contain venting and fire.

I have a Intellicharger V4 and a cheap wallwart charger that charges to 4.25v. I have all the “new cells” charging as we speak,…but I am scared of the older cells??

I’d be worried too, about charging those Panasonics. Even good brands can vent.

I'd hate to destroy the charger if the cell blows. Can you put together some leads to use the i4 to charge cells remotely?

I’ve pulled many old battery packs, most times you will find 2 cells below 2v
You can charge them up but in my experience their capacity is around 800mAh or less , the 2.49V cells might come back and provide a reasonable capacity of 1200mAh, which is fine , but you will always have doubts.
Most cells from a laptop pull are around 2200mAh rating, so is it worth it to keep used cells between 1000-1400 mAh? I do use them so for me it’s a worthwhile exercise, besides I enjoy fiddling with the whole process.

It’s also a good way to learn about older cells and their behavior as long as you have the correct equipment to monitor charge / discharge conditions accurately.

You need to know that if the temperature rises suddenly on a old cell during a charge or discharge, it’s time to pull the plug and toss it fast.