Damn, I have a timing, you must have made it just today! I’ve looked there so much today, good tests HKJ
Please is it really red cover on the 2800mAh ZT version?
It looks like orange and elsewhere is named as UR18650ZT 2800mAh violet/orange 4.3V.
What does the “bv” mean in the name you gave it?
You can see a wide selection of Sanyo, LG, Samsung on keeppower, Sanyo’s (FM and ZT, unprotected and protected (probably made in house) as well) have a good deal on FastTech. That’s where I want to get a couple of Sanyo’s and decide whether to take a ZT or FM.
Here are my notes and what I found elsewhere:
Code
stated mAh
ring
sleeve
Volt
UR18650W2
1500
pink
red
4.2
UR18650FJ
2200
red
red
4.2
UR18650A
2250
violet / white
red
4.2
UR18650FK
2400
green
red
4.2
UR18650FM
2600
teal blue
red
4.2
UR18650ZT
2800
violet
orange
4.3
UR18650ZTA
3000
yellow
violet
4.35
And many more!
The ring color denotes capacity.
The cover color probably indicates different voltage.
UR18650FM is a good battery so I’m interested to see how do the newer ones perform.
Yes if they are 4.3V and 4.35V, their capacity at 4.2V will be around 2650-2800.
They can be easily compared to the LG an Samsung 4.3V 18650s.
This includes the UR18650FM 2600mAh!
See HKJ’s comparator. (pics below)
What a surprise right? UR18650FM is very similar to LG 18650 C2.
HKJ can you determine what is the final voltage of a particular battery?
Can the Sanyo UR18650FM hold 4.3V as well? Or 4.25V?
I think lithium batteries are not tolerant to overcharge?
Basically the battery should start to heat up when it begins to get overcharged and it won’t hold the higher voltage.
How do you charge the 4.3V and 4.35V batteries to this voltage?
The Imax you have, or am I wrong?, can be set to charge to higher voltage?
“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.
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.
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.
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).
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.
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.