New version (6.0) NOW 7.0 of the miller ml-102 charger...

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wight
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Thank you gbates. Good work!

It may still be possible to get 2A out of the MT5032A, but as you can see it will be hard on the 18650. If you are measuring 2.2A @ the battery (~4v?) and 0.95A on the USB output (~5v) then we are only seeing approximately a 50% efficiency! So maybe like 4-5A at the battery once it sags… that will not be good.

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

Pöbel
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it’s way more than 50% efficiency as the Voltage is boosted to USB Specs.

wight
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Pöbel wrote:
it’s way more than 50% efficiency as the Voltage is boosted to USB Specs.
Do you understand my assumptions and my math?

Still fine, still on a break. One day I’ll catch up with you folks! previous wight catchup Wink
list of my drivers & variants (A17DD, FET+1 stuff, WIP stuff, etc)

harry218
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I just received my ml-102 V7. I measured the current of USB output at the battery (Sanyo UR18650FM) and I got 1.31A to my Nokia 520 which has a very small battery (1430mAh). I know this is not accurate, I should have followed the method suggested by ‘wight’ but the charging process is much faster than the stock Nokia charger which rated at 750mA. So I did another test using a USB extension and the current is significantly lowered to around 700mA. The charging time is now much slower and closer to the stock charger. On another note my unit cut off at 4.16V.

WarHawk-AVG
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I got 4 V6’s from FT

I replaced the RProg resistor to 2.2K, all mine now charge at 500mA~ sure it takes a few hours, but I know it won’t overheat the TP4056 and won’t over stress the batteries

The V7 looks nice

I ordered a 10 micro USB and diodes (was going to put the micro in parallel to the mini usb) wouldn’t you know it, it got the V6’s that have only the micro…

If anyone has the V5 and would like micro usb put on there shoot me a PM and I can solder em on for you so you can have micro usb inputs not just mini

harry218
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WarHawk-AVG wrote:
I got 4 V6’s from FT

I replaced the RProg resistor to 2.2K, all mine now charge at 500mA~ sure it takes a few hours, but I know it won’t overheat the TP4056 and won’t over stress the batteries

The V7 looks nice

I ordered a 10 micro USB and diodes (was going to put the micro in parallel to the mini usb) wouldn’t you know it, it got the V6’s that have only the micro…

If anyone has the V5 and would like micro usb put on there shoot me a PM and I can solder em on for you so you can have micro usb inputs not just mini


What is the size of the resistor you swapped? 0805?
WarHawk-AVG
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harry218 wrote:
WarHawk-AVG wrote:
I got 4 V6’s from FT

I replaced the RProg resistor to 2.2K, all mine now charge at 500mA~ sure it takes a few hours, but I know it won’t overheat the TP4056 and won’t over stress the batteries

The V7 looks nice

I ordered a 10 micro USB and diodes (was going to put the micro in parallel to the mini usb) wouldn’t you know it, it got the V6’s that have only the micro…

If anyone has the V5 and would like micro usb put on there shoot me a PM and I can solder em on for you so you can have micro usb inputs not just mini


What is the size of the resistor you swapped? 0805?
Yes 2.2K ohm 0805 size
Werner
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wight wrote:
Pöbel wrote:
it’s way more than 50% efficiency as the Voltage is boosted to USB Specs.
Do you understand my assumptions and my math?

LOL
I had to get out the calc: (5×0.95)÷(3.7×2.2)=0.58.
If way more is around 8% more than Pöbel is right…

The funny thing is inside the phone there is another buck circuit which leads to additional losses….greenhouse effect we are comin…

chenko
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Guys I have a question, regardless of version of be ML-102: can I store a 18650 cell in it REVERSED (positive on spring, negative on tab) to prevent draining the cell?

WarHawk-AVG
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No (putting them in backwards could damage the electronics), if you want to store them…just slip a small piece of plastic or strip of paper over the + terminal when you slide it in the charger to break the electrical circuit…then pull it out when you want to use it, of course it breaks the circuit so it won’t charge either

Simple solution but the reverse draw is usually very minimal compared to some internal self drain…

chenko
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Thank you! I left it reversed for 1hr and hope not to have damaged it (it lights up normally anyway).

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