My first C4-12 also had some suspicious behaviour on slot 4. I have put in some Samsung 30Qs with button top. While slot 1-3 were fine, slot 4 indicated an inserted NiMH battery (1.4V) instead of Lithium Ion battery (4.2V). The battery in slot 4 was absolutely okay as I have checked it before and after. I don’t know what would have happened if I had let the charger started to charge. I sent this defect device back to Amazon. Now, some months later I bought another C4-12 and so far, this one seems to work as it is meant to. However, I never charge batteries overnight or in personal absence.
So I been looking around at chargers and have been seeing charge rates of “C”, I have no idea what that stands for or means. Im sure someone here on the BLF does.
I know this is kinda an older thread… But can anyone help me out with understanding this C stuff or send me to a thread that I am having a hard time finding please?
C is capacity. So if a charge rate is 1C on a Samsung 30Q then the 3000mah (3000 milliamp is the same as 3A) rate is 3A.
A 0.5C charge rate means half the capacity. So a 3000mah 18650 would be 1.5A.
A 0.25C rate on a 3000mah is 0.75A.
0.5C on a 5000mah 26650 would be 2.5A.
0.5C on a 1000mah 14500 would be 0.5A.
Get it?
Got it! Thanks Jason.
I bought a c4-12 about 6 months ago from AliExpress, and after a few months it started showing ‘Err’ message for a lot of the batteries that I was putting in. Now it is showing every battery as ‘Err’, doesn’t matter which slot, or which battery. Has anyone else had this problem? BTW, these ‘Err’ batteries charge OK in my NiteCore charger, and work OK in devices.
A person above had that problem. See if cleaning the contacts has any effect. If not, I’d contact the seller or Miboxer.
Thanks for replying Jason. Since posting my question, I belatedly tried the old trick of disconnecting the power pack, and reconnecting it. Bingo … problem solved, all working as it did when brand new. Could have saved myself weeks of fretting!
Since posting my question, I belatedly tried the old trick of disconnecting the power pack, and reconnecting it. Bingo … problem solved, all working as it did when brand new. Could have saved myself weeks of fretting!
Unplugging and plugging back in should be the first thing you try. Lol
Is Miboxer still alive? On the Homepage I don´t find chargers.
And the specs of Miboxer reminds me a bit on Dlyfull chargers, especially the selection of charge currents and the testing capabilities for the 4th slot only