18650 5000mah vs 26850 5000mah battery

Daylighter you are free to buy whatever fake battery you like, but please don't pretend they are real or even less that the capacity numbers are real!

Betweenrides gave you a very interesting link, read it. Most (if not all) discounted cells on sale on ebay are just recycled (used and thrown as garbage) laptop battery packs, dismantled, the cells rewrapped with some new labels an sold to innocent people that only read the label and unknowingly believe they are good quality products.

There's no quality for cheap in today world.

The ONLY way one can have some profit selling 4 cells with free shipping at $12, is that the cells came for free.

Feel free to not believe my words or other savious members here, but ask someone with a serious RC charger to charge and discharge your cells, writing down the actual mAh. You may end looking under a different light your purchases.

Quality cells sold from reputable members have a proven record of real capacity numbers, tested independently by other members.

Oh, a last note, just for safety: please stay safe, don't even try those cells in multiple cells flashlights. One bad cell going deplete and reverse charging from the others could well transform your flashlight in a hand grenade.

Dangerous. Not joking at all.

Don't know if you have any basic preparation on electricity and similar.

10000mAh means 10Ah, that's 10 Ampere for one hour. Have you got an idea on how much current is that?

An average car battery (that's lead battery I know but that's just for example) has between 40Ah to 80Ah, with a peak performance of 600A to 800A for shorts burst (cranking the engine)

If your cells were really 10000mAh you could well link together 4 parallel groups of 8 cells in series and pretend them to start your car.

See the point?

Only when the numbers are totally made up lies.

A 14500 (AA size) li-ion of HIGH quality is likely to be 700-800mAh in most cases. Crapfire low quality ones are often 100-200mAh - despite what the sellers claim or the labels say. Also under high load many of the cheap batteries perform very badly.

Most 18650’s are 2200-3100mAh depending on spec. Again crapfires are likely to be less than half the capacity.

Basically buy quality and you’ll see the difference and never want budget batteries again. :slight_smile:

I’m vaguely suspicious of the text on the blue 18650 -
Good 18650 5000mah.

Talk about targeting your audience.

The 26650 looks like a keygos cell but with ultrafire written on. If it was a keygos cell, I’d suggest its not a bad cell, from run times on mine, I’d accept their between 3000mah and 4000mah. With them being eBay ultrafire cells, they could be anything inside the casing upto and including 10440 cell wrapped to 26650 size.

Hkj just tested some new 26650 cells, their not available to market yet, they only just beat the king Kong 26650 capacity that has been the top dog for a while. They are protected, upto 8a.

As said, its your money, but more importantly, its your health at risk. There was a thread in the recent posts last night, its about a year old, but has some links on cells going wrong in a sealed aluminum tube with thin threads (a flashlight), it’s interesting reading, and people’s only concern here is your own health, nothing more, nothing less.

Send all those 18650s back and buy one or two good ones

You gambled and lost on those cells. The family-friendly nature of this forum precludes me from giving you an accurate description on what you bought.

As others have said, you are better off binning the lot and picking up a couple of Kumabear's known-to-be-good Panasonic-based cells.

thank you all for the advises… just to be clear… i’m not a seller trying to lure customers with new batteries
i’m just a noob who found this website by accident and decided to join in :slight_smile:
i didn’t realize or never even think that batteries can in fact become hazardous to your health
the only bad experience i have … the most was the battery got leaked and corroded inside the tube.
i just e-mail the seller and asked her which company makes this battery
hopefully i’ll get the answer soon… meanwhile… i guess i’ll stick with panasonic batteries for now
what do you guys think about sanyo batteries?
btw… is there a way to test battery to see how many amp in the battery?
the only experience i have with electric is… to turn on the switch :bigsmile:

You can buy a hobby charger, that’ll be able to run a diagnosis on any battery, have a look in the batteries and chargers section here for lots of good advice/recommendations.

Sanyo, Samsung, Panasonic, LG, all make good cells, just find a known good seller and accept that 12 dollars will likely buy two lower capacity cells (say 2400/2600mah) the difference is, these cells will actually be close to that capacity. 8)

You’ll also find these cells will actually power higher powered lights, the protection circuits will work and there’s less chance of flame/explosion/pipe bomb incidents.

That speaks volumes about the sellers confidence in the quality of the cells and accuracy of the labeling.

check this one, he says it can jumpstart the car :slight_smile:
batteries

Yeah, but those are LiFePo cells.. whole other story. Those cells you got are pretty sure crap.

Here's what you can expect from your "5000 mah" 26650 batteries.

#new

I sincerely hope you don't plan on using these batteries in a multi cell flashlight.

I get my batteries from HD Canada. They test every single battery they sell. Each cell comes with a sticker with the date and tested capacity.

now thats the seller u want to buy from. just to reconfirm u get hobby charger to check capacity after full cycle.
Discharge > 3.7V then full charge to 4.2 volts. thats how u tell the capacity.

we’re all noob once we all made mistake of getting shit cells on ebay for cheap but u’ll learn….

a good 18650 retails for 30$ in australia so if u get it for 10 $ from overseas shipped to u its still a bargain!

just youtube some videos of exploding ebay cells :slight_smile:

you're at the right place ....you're just not paying attention .

i believe the leads doesnt make any difference what so ever. with those cheap multimeter already calibrated for the lead they are using. if u change the size of it makes it inaccurate.

Nope, they definitely can make a difference - long thin leads give more resistance to a circuit, discounting the resistance the meter adds, add resistance and current drops, hence low readings. Either get some thick wire and make some leads or buy decent quality leads, we are after all measuring pretty small amounts of current.

I wonder when the Chinese will “develope” some even higher capacity cells. Keep an eye out for the next batch, surely they’ll be in the 12,000 mah range.

And not just any LiFePO4 cell, those are A123 Systems proprietary nanophosphate cells. There are no other cells on the market that even come close to their current handling abilities. And since A123 just went bankrupt and is in liquidation, there may never be any more.

Actually Samsung’s LiFePO4 cells are just as good (at least 18650-sized ones) :stuck_out_tongue: