i am sorry i didn’t get that
my question if i charged my power bank in full ( 20400 Mah )
how many mah i get out from the power bank
for me to calculate how many times to charge my iPad or my mobile
thanks
i cant understand this
i have Qidian 5 batteries box i put in it my broken Chinese power bank batteries
it written on them 2200
so i put four of this batteries ( 8800 ) in the box
i made calculation i found that i am getting 6050 mah
so its 68.7%
how come i get 58.8% out of this panasonic and they are a lot better
There are two loses in mAh when using a battery box, first is due to the voltage difference and it cannot be changed, the other is due to the converter doing the conversion of the voltage. In this box here the conversion efficiency is about 90%.
Thanks! I was skimming and was looking for the terms like ‘storage’ and ‘drain’ and didn’t see it. So this box looks good to be able to leave the batteries in there for 6-months (emergency batteries?)
Well after about 8 months of light to no use, my power bank has developed a charging problem. USB output still functions normally, but it only charges the internal batteries to 3.85V, then the 80% LED stops flashing. Charging intitally stopped at the 60% mark and I had to reconnect the charging cable several times before it attempted to charge more, but this doesn’t work once the batteries reach 3.85V. It seems to do this regardless of whether there’s 1 or 6 cells loaded. These are new laptop pack pull LG 2200 mAh cells which have only been used in this power bank. The cells are charging / testing without any issue in my Opus, so they don’t seem to be the issue. I may have to poke around to see if there’s an obvious failed SMD resistor or some other component like the poster with the LED failure.
I’m wondering how reliable that is — thinking about using it to discharge cells down to 40 percent for storage purposes.
I’ll be trying it, but curious if anyone has done that and checked results (or has another recommended way to take batches of cells down to 40 percent for storage time)
I use my hobby charger to discharge my batteries down to a storage charge. It seems to me that one could hook up a number in parallel and then discharge them all down to 3.7v - 3.8v. I parallel charge cells up to 4.2v so it seems to me that discharging them in parallel should work just as well.