“Confirmed”. It’s not hard to find out, just put the code name into google images :bigsmile: Chinese shops (alibaba) will show up and their pictures of batteries. So yeah, some may be fakes, some not, but hey, we all shop on Chinese shops mostly anyway.
^did I forgot this or not, maybe broken image link.
It’s a guide how to decode the Sanyo batteries.
Just wondering, where you got Sanyo 3000mAh cells for testing? And, seeing how poorly they did, have you charged them up to 4.35V?
Yeah I wanted to clarify that, I don’t test, I just collect info from net, I found the two graphs full of batteries on one ebay listing with some batteries (Panasonic 3100mAh) and saved it. The code and partial list that I verified with keepower, fasttech and HKJ photos is from “laserpointerforum”:Sanyo 18650 batteries from cnqualitygoods.com | Page 2 | Laser Pointer Forums - Discuss Laser Pointers | High Power Lasers. IMHO they were charged to 4.2V in the red/blue graph from ebay seller big_f_d_d. Personally I think LG, Samsung and Sanyo might be very similar. If not even having the batteries made in the same factory or copying each other. I doubt Sanyo’s are made in Japan, all they can they moved to Korea or China, cheaper to make it there. The Sanyo ZT 2800mAh 4.3V and ZTA 3000mAh 4.35V don’t look good so far and nobody seems to have any to test them. Are they so new? The FM 2600mAh 4.2V might actually outperform the ZT and ZTA at 4.2V, which is kind of sad. The FM seems like a powerhouse, it just doesn’t extend as far as other batteries but rather keeps higher voltage all the way until it drops rapidly. On HKJs testd it even seems to beat the Panasonics, nothing holds the voltage so high as the FM only the 4.3V LGs and Samsungs. That’s why I ask if the FM is not by a chance also 4.3V and if somebody can safely test it.
Nope, FM is 100% not 4.3V, it first appeared in 2006 (or so) when 4.3/4.35V cells weren’t even heard of.
Good, resolved :bigsmile:
Were they this good even back then? So far I can’t find another battery like that. All the other ones except new 4.3V+ seem to drop voltage much more compared to the Sanyo 2600mAh.
HKJ: the size of the ZT 2800 you tested is with protection right? Because it does not seem big unprotected nor is anywhere said it’s bigger. The bigger length is probably due to the big button top and a protection PCB on your particular version that uses this ZT cell.
When I know the correct cell type, I usual write it in the info box.
But with the Sanyo I did miss it the first time around. This has been corrected on both Sanyo batteries now.
That it is from bestvaping, all my tested batteries must have different names and I already had one called "Sanyo 18650 2600mAh (Red)".
Only by looking at the datasheet.
When overcharging LiIon the voltage will continue to rise, until the battery breaks down.
The ICharger can charge to 4.3 volt, but I uses a computer controlled power supply when testing.
Yes, a unprotected battery is usual 65 mm long.
Sanyo 18650 2800mAh (Orange) 
That would have been fine, if it was sold with that name.
Thanks for the info, so like I thought the 2800mAh version is with a protection worse than the 2600mAh version. That was my impression, too.
Hkj how about stripping the protection on one of these and making a 4.3V test?
I could send some dollar with PayPal, for destroying your cell.
I could send you one of mine,but shipping in eu is more than a whole cell with shipping from china.
I will probably buy some new unprotected cells later on and test them at both 4.2 and 4.3 volt.
But it will be some time, I have more than enough batteries at the moment.
You want to share a picture of your to-do pile? :P
Sorry, I do not have time just now (I am leaving for a party now), but it is mostly small TrustFire and UltraFire, there is also a TrustFire 26500. In a few days I receive a pile of Efest batteries (again).
Alright, happy partying. :)
When I get these cell, I will call them that, but the last ones where sold as 2600mAh.
According to the SKU:1804 you bought the:
Sanyo Button top 18650 2800mAh 3.7v rechargeable protected Li-ion Battery(1pc)
Now they advertise it as 2800mAh and the description you have on the test seems copied from the 2600mAh version. At first I thought they’ve sent you a wrong battery when you wanted to buy a 2600mAh FM. They probably updated the info and title now.
I would imagine that the ZT would give more cycles @4.2V than the FM would. Does anyone know if this is actually the case?
Generally, undercharging will extend the life of Li-Ion cells. Not discharging to the bottom has longevity benefits as well.
I ordered 5 packs of the Sanyo 2800ZT cells and will post my test results when I have them.
I noticed that both batteries are equally cheap at FastTech and I was about to ask the same question.
I need batteries for caving lamp. The common scenario would be that upon my return from cave the batteries will most likely not be depleted. I’d clean my gear and put batteries charging so the light is ready in case I need to go in a cave unexpectedly (cave rescue). Sometimes they would be left fully charged for weeks or a month. I believe that the 2800mAh 4,3v Sanyo would be less affected if stored charged at 4,2v and have the same capacity as the common 2600mAh 4,2v Sanyo.
I got my xtar 18700 2600mAh.
I thought from the test that they are the Sanyo zt.
But why have these about 0.1Ah more capacity, both charged to 4.2 V?
Sanyo 2300mAh
Xtar 2400mAh
Should I rip the wrap apart from the xtar?