Today I received couple of bare Panasonic NCR18650B cells from a seller(dis closer later)and i’m skeptical on the these. Before jumping back to the seller,I though it would be fair to share this here and ask your opinion.
In the above,one could see little bubble in the label and misaligned text “Short Circuit”.
The weight of these cell have little varying however it is not per official panasonic 47.5g.
(DX cell on Top)
Comparing with bare NCR18650B from DX, the overall texts in the label were sharp and not misaligned.The “B” part in NCR18650B seems to be little different than the DX cell. I can see label color is little on lighter side and more glossy .
Unfortunately I have to wait few weeks for my friend’s B6 if It has to be proven scientifically. I’m asking is there a simple way to test these?
Although running a discharge test the the most accurate way, some alternative methods could be measuring the runtime on a flashlight and comparing how long they run before the output drops and the driver’s protection is triggered.
Does it have a serial number that can be looked up?
Slight wrapper imperfections are in no way reason for thinking of fake cell. Nor is the slight weight difference or weight itself - mine weight around 48g incl. the protection circuit. You need to be looking for electrical behavior of the cell. Capacity and internal resistance. What voltage did they arrive at? (at least)
I’ve seen these before: no way I’d buy any Ultrafire after. I didn’t notice the Uranusfire before though…kinda tempting, if I didnt mind supporting the people who made these, I might buy Uranusfire wrappers to put on my nicked laptop battery pack pulls instead of plain wrappers for fun
I find my hobby charger of great help when it comes to testing cells. From laptop pulls to brand-new NCRs, I always make it a point to fully-charge them first and do a discharge-capacity check on each of them. Regardless of brand and physical looks, there is no surprise when you have a hobby charger. This, and a good DMM, is a must I should say.