Because sanyo 2800mAh, should be charged to 4,35V to have 2800mAh capacity. Battery protection allow only about 4,2V. So 2600mAh could have more mAh than 2800mAh.
Search Sanyo UR18650ZT I believe, they are newer 4.3V cells, been asking similar questions before buying the 2600mAh, look around you will find it
They are not bad but are 4.3V and won’t give you 2800mAh without going to 4.3V and maybe even then they might be slightly over rated.
Cannot, covered it in another thread somewhere, I have a limited version that has Lixx internal resistance testing, can’t be calibrated by entering the startup configuration mode by holding buttons, I have tried all combinations before. Only option would be to modify the firmware or adjust the sensing resistors or something, none of my equipment is calibrated so it’s impossible anyway.
It also doesn’t have logging output, only temp. probe in the options.
hmm - any more info on this? I have 4x of these which I ran in my firefoxes 3 in series which supposedly pulled 4a fine… the cells got warm but i didnt notice any sag?
I am running the same 4x in my skyray king now but i guess the currents much less because the 4 of them are in parallel.
I am curious now, I think I might throw mine on my hobby charger this weekend to see whats up lol.
Well I have only one flashlight, sure I could dig out some resistors and measure Amps with my DMM, I’m quite sure the battery can supply tons of Amps, at least if you look at discharge graphs in some other tests, they do test it at 5A.
I think it is the driver or emitter in my flashlight, it overheats quickly with so many Amps, heat rises, resistance increases, Amps go down.
Did you measure that internal resistance using the new Turnigy Accucel 6 LiXX Internal Resistance feature?
How do you do that for a single cell? I tried, but it does not give me any value - seems that I need a balance lead as well? On your picture, it seems you are using a special balance lead (with only two wires) - could you elaborate on that?
Yes, I’m not sure how accurate it is, if you have a precise/calibrated DMM and a resistor of appropriate value you can measure it that way.
I use the Turnigy’s feature.
Yes you need to connect it to the balance port obviously
That is how it works, charging port is for power, charge, discharge.
Balance port is for monitoring cells, measuring cells, balancing cells (low current).
Just connect the battery correctly to the balance port. From right: GND, cell1, cell2, …
Find the UR18650F, or rather get the specs from the source you’re buying them from, who knows what they are selling, they should inform the buyer.
If you already have them, just test them to find out capacity and so on.
UR18650FM 18.5mm diameter over the protection connection strip, otherwise 18.35mm.
Why would you buy ZT? If you can charge it to 4.3V, why not, otherwise it might actually be worse than FM if charged only to 4.2V.
I could probably charge to 4.3V on my Turnigy in LiPo setting, maybe, maybe to even 4.35V, I know my LiPo had around 4.3V when finished. Would have to charge it again to find out.
Otherwise you are out of luck charging over 4.2V, need a rare charger for it.
I have four pc of UR18650ZT, protected. I could not charge higher than 4.25v because the protection circuit switched off. Then the capacity was lower than for the FM version.