Charger Miller ML105 V1.0

DSC_1362

DSC_1363

This charger is a very small 26650 charger, it needs an external USB power source.

DSC_1359 DSC_1360

There was no retail box for the charger and the only accessory was a polishing cloth for the clear lid.

DSC_1364

The charger has a micro usb connector for power input.

DSC_1759

The charger has space for 3 leds, but only two of them works.
The red one will show steady light when charging.
The green one will show steady light when done.
Without a battery in the charger the leds will alternate fast.

DSC_1365

This looks like space for usb output, but the charger is not equipped with that.

DSC_1368
DSC_1371

The led has no hinges and must be removed to charge 26650 batteries.

DSC_1372 DSC_1373

The battery slot is nearly fixed length, but behind the metal box at the back there is a spring, this allows some variation is accepted. Length must be between 64mm and 69.6mm, this means some protection cells will not fit.

supportedBatteryTypes

supportedBatterySizes DSC_1370 DSC_1371

The charger can handle all unprotected 18650 and 26650 and many protected cells.
It is possible to charge some smaller IMR (high current) cells on this charge by using a spacer, but check the charge specification for the cell first.



Inside the charger

DSC_1761

The charger is easy to open, only four screws must be removed and it can be pulled apart.

DSC_1762

There is not much electronic in the charger, only a buck converter for handling the charging and a couple of transistors.
There are two leds in this charger.

DSC_1763

There is nothing on the bottom, except the type number and version.

DSC_1764

DSC_1765

The charger has been prepared for more leds, it has 3 light pipes.



Measurements


Miller%20ML105%20(PA18650-31)

The charger has a nice CC/CV charge curve.

Miller%20ML105%20(SA18650-26)

Miller%20ML105%20(PA18650-34)

No problem charging 18650 with 2600mAh and 3400mAh either.

Miller%20ML105%20(SH26650-35)

A 26650 is also charged fine.

Miller%20ML105%20(BE18650-26)

An older cell makes the charge circuit a little bit unstable, but the cell is charged fine.

Miller%20ML105%200.5ohm%20(PA18650-31)

Adding 0.5ohm in series with the usb power supply to simulate a long cable or weak supply did not present any problems.

Temp2532

M1: 28,0C, M2: 30,6C, M3: 27,4C, HS1: 32,7C

There is not much heat in this charger.

Startup

The charger is a dumb charger, i.e. no microprocessor that needs to initialize or anything, when power is applied it will start charging immediately. This type of charger works perfectly with a solar panel.



Conclusion

The charger is a good charger and with the spring in the back it can handle many xx650 cell, both protected and unprotected (Very long protected cells will not fit).
The charger current is a bit above 1A, this is fine for most 18650 and all 26650 batteries, but a bit high for old 2900/3100mAh cells, if you have many of these cells and want to make the last as long as possible: use another charger. For other cells: enjoy the faster charging.



Notes

Here is an explanation on how I did the above charge curves: How do I test a charger