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?
The ideal storage voltage is around 3.75-3.8V. The worst case is fully charged; over time this will permanently increase internal resistance and reduce capacity.
For the ZT cells, storing at 4.2V should be better than storing at 4.3V.
Can we guess how much capacity the ZT loses when only charged to 4.2 or 4.22 V? Will it perform like a 2200 or 2400 cell? The graph above indicates that the cell is only ~90% true to it's capacity when charged at 4.3V which would already make it a ~2520 mAh Cells... minus the capacity loss due to premature charge stop due to most chargers cutting of at 4.2V. Can anyone take an educated guess?
2300mAh like mentioned before…
Here is my comparison graph of the UR18650ZT vs. Panasonic NCR18650A. This was charged to 4.3V. I’ll charge it to 4.2V and retest.
Discharged at 1A.
The ZT has a slightly lower capacity than the Pana NCRA, but the voltage throughout the discharge cycle is much higher, which is very important for single cell lights.
For example, if a light could output 100% down to 3.5V, the Panasonic could go for ~1.5 hours, where the Sanyo would go for almost 2.25 hours.
The Sanyo ZTs work well for me. I have 10 of them and will likely get more.
I will mainly be using the Panasonics in multi-cell lights where the voltage is a little less important.
Thanks for the comparison. Could you also compare to the NCR18650B?
Were both cells unprotected?
I am curious of the 4.2V graphs, we all know it is much worse but nobody has tested the same cell at both voltages yet.
I do not have any NCR18650B cells to test.
Yes, both were unprotected.
I should be able to complete the Sanyo ZT @4.2V test today sometime and get the results up tonight.
My guess; less than 250mAh lower than when charged to 4.3V.