Review: USB battery box 2x18650 enb

[HKJ]

@Saya

Can i make my own curve with my xtar vc4
That i connect my battery to multitester for precision voltage and i record video from xtar vc4 for Ah and multitester for voltage
( i think it more likely for review charger isnt it?)
For review battery we need constant load ?

Yes, you can make a charge curve, but as you write a constant current discharge is better for battery tests.
Something like this could be used: Test/review of Electronic load ZKE EBD-USB

[Saya]

@HKJ

@Saya

Can i make my own curve with my xtar vc4 That i connect my battery to multitester for precision voltage and i record video from xtar vc4 for Ah and multitester for voltage ( i think it more likely for review charger isnt it?) For review battery we need constant load ?

Yes, you can make a charge curve, but as you write a constant current discharge is better for battery tests. Something like this could be used: Test/review of Electronic load ZKE EBD-USB

Im sorry too many question I want to get most of my old 18650 battery for power bank(even though i have other good one) with cut off voltage is 3V

I use one with single battery

so i calculate this

i readout with usb tester and iphone it draw . Let say 1A 5v

5:3.7:0.8(80%efficiency)=1.7A

with some work and component i can make it half to make iphone only draw 0.5 A

which is 0.85 A to the battery

And in your curve it is almost close between 1 A and 2 A at 3v

is you recommend me to make some work to make it 0.5 ? Is it worth?

I already read voltage jump from your article

I dont really know how much single 18650 draw ampere if use as power bank with 1A

thankyou

[HKJ]

[quote=Saya

is you recommend me to make some work to make it 0.5 ? Is it worth?

[/quote]

Old batteries will work better and live longer at lower current draw.