18650 3.7V 6000mAh Li-ion Rechargeable Battery WANTED

[pete52]

Looking for some 18650 3.7V 6000mAh Li-ion Rechargeable Battery Thanks Pete.

[some bloke]

I don't think they exist mate - best I've heard mention of are 3400mah's

[phoenix]

You could wire up 2 x 3000mah in parallel.
As long as each battery has it's own protection circuit, charging shouldn't be a problem

Cheers

Bruce

[Radagast]

The issue with Chinese batteries is the same as Chinese lumens. It's cheaper to print a label than to actually build the product.
Ultrafire 6000mah batteries have an actual capacity of 1500mah.
Test data here:
http://budgetlightforum.com/node/33289

3400mah batteries with a Panasonic or Sanyo NCR18650B cell inside will run 3300-3400mah. Pretty much as advertised.
Example:
http://lygte-info.dk/review/batteries20 ... %20UK.html

There is a 3600mah cell, with an actual capacity of 3400:
http://lygte-info.dk/review/batteries20 ... %20UK.html

You can buy unbranded Panasonics from Banggood. I've bought 30 or so, no issues:
Test data:
http://lygte-info.dk/review/batteries20 ... %20UK.html
Link:
http://www.banggood.com/2PCS-NCR18650B- ... 40444.html
Only issue with them is delivery can take up to 45 days due to restrictions on airmailing batteries.

Or you can buy from the UK supplier most recommended on this forum, Torchy The Battery Boy:
http://www.ebay.co.uk/itm/2x-Torchy-Pan ... 43d1f41747

Basic rule of thumb is any battery labelled xxxfire is Chinese, probably crap and potentially unsafe. Stick to Sony, Panasonic or Samsung.

[hibbydunk]

yep stay well clear of xxxxfire bought two ultrafire before reading about on net a few months ago couldn' get them to charge would run out of puff after 20 mins and then saw they can go on fire if left unattended. Radagast you seem to know batteries whats the difference between no pcb protection and having it. the nightfire 400 and my tracer 400 both came with pcb protedted batteries but quite frankly a bit of gobbledegook to me. does it make a diference and what goes in what ? cheers if you can help.

[Radagast]

I'm no expert, I just pretend to be one on the internet.

That said, a protection circuit will prevent over discharge, which can kill the battery. It basically stops the battery while still holding enough voltage to keep the cell working. Otherwise it would keep running until it dies, kind of like the original marathon runner.

It also prevents overcharge, which can, in extreme cases, cause a fire or explosion.

In multi cell batteries the protection circuit should prevent unbalanced charging, which can kill one cell and therefore the battery pack. Laptop computer battery packs usually have 6 or 8 unprotected 18650 batteries with an overall protection circuit to ensure balanced charging.

Chinese blue box 12 volt batteries from Ebay lack proper protection. Both of the 3 cell (6800mah labelled, actually 2100mah) batteries that I bought died with a single charge. Obviously no balance charging circuit. The single cell (1800mah labelled, actually 700mah) is still running. I'm careful to not overcharge it or run it flat.

Elwirecraft is the UK supplier most recommended for 12 volt blue box batteries.
http://stores.ebay.co.uk/ELWIRECRAFT
They offer them with and without protection circuits and guarantee capacity matches the label.

If you are using unprotected batteries then you need a charger that can sense capacity and cut off charging when full. You also need to be sensible in the field, watching the amount of time you have run them, then swapping out before they go flat.

[hibbydunk]

sounds a bit like the litium batteries that i ran in 1:10 eletric toouring cars although i don't really go much now. if you overcharge them they go on fire if you over discharge them they go on fire and when storing you have to keep them around 50% chareged and keep them in fire retardent saftey bag. thx for your explanation it all bit clearer now and sort of explains the touring car bit which i didn't really get before.

[Dave333]

Ultrafire dont make them bigger than 3000mah,anything saying its Ultrafire and a higher mah than that is FAKE.

[Radagast]

Dave333:
The problem with Ultrafire is there are multiple counterfeit products using that name.
As an example, here is my experience with DX and Ultrafire 501B torches:
Black host only: crap quality, parts missing.
Black torch: Decent quality. Works.
Anodized aluminum torch: Excellent quality, perfectly cut threads, knurling. Maybe original Ultrafire OEM?

I'm not willing to take that risk with batteries that can explode, turning a torch into a shrapnel grenade, or catch fire and can't be put out.

hibbydunk:
Those batteries would have much higher discharge rates and I assume a somewhat different chemistry. 18650s are laptop batteries and its very rare for them to catch fire, even though every house & office has one these days.