Review of Sanyo 18650 2600mAh protected on the positive side

Batteries and Chargers Rechargeable Batteries
3

Thanks lagman. Can you put review completed in the heading when your finished as I'm interested in your closing results. Cheers.

4

18650s vent through the top. Tho they should be able to fit a few holes in a top mounted PCB.

5

@MRsDNF: I will. results should be online in 2 days.

6

well done review. thanks.

7

How did you get them for $8.36 when the Web page says Price: US$11.99?

8

I ordered a few along time ago at this price as well when they had the special running. I don't believe that mine have been shipped yet though a number has been issued not long ago (all the details are at home).

9

Sorry I missed them. Would have gotten a few.

10

Updated with capacity measurements. Enjoy!

11

Thanks.

12

Price has been jumped up to $11.99 now!

13

I updated post #1.
My initial measurements of overcurrent protection were done on cell 2 only.
I later realized that one of the cells would not power my Flashlight that needs about 3A.
So I tested both cells and guess what! One cell 1 seems to be missing one MOSFET. It has half the current capability of cell 2.
Rather disappointing…

14

Update post #1
Added a picture of the PCB.
That cell being defective I decided to remove the clear heat shrink. The black cap fell of after that, revealing the PCB.

15

Thanks for the update. I'll do some testing on mine if they ever turn up..

16

It looks like I was lucky to get them so quickly.
On almost all DX orders I get a defective item or an item that doesn’t match the description… I’m getting tired to ask for a partial refund!

17

Trying to debug the defective PCB, it seems that one chip on the PCB is dead.

The voltages are the same for both chips as they are in parallel. However under load on chip gets hot but not the other.

pin 1,2: Reads VDD; Connected to positive pole of the battery.
pin 3: VDD
pin 4: GND
pin 5,6: GND
pin 7,8: Reads VDD; Connected to button top (positive)

I have no idea what pin 3 and 4 are for. They are connected to capacitors. No idea why.
Can somebody help?

18

I’d get a couple new ones from FT.

http://www.fasttech.com/product/1225103

2 pieces for 1½ bucks :slight_smile:

They’re 4 Ampère each

19

Yeah but on my cell the PCB is on the positive side, meaning that the PCB needs to have a hole in the middle like a donut. :slight_smile:

20

argh…of course… :Sp
sorry…

21

I think I’ll just use this cell in low power applications. But I’m curious to know how that chip works… And why it is connected to capacitors.

22

I will look that up ’cuz I am curious also. I just have to eat first.