Test/review of Golisi O2 Smart charger

1 post / 0 new
HKJ
HKJ's picture
Offline
Last seen: 3 days 17 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7432
Location: Copenhagen, Denmark
Test/review of Golisi O2 Smart charger

Golisi O2 Smart charger
DSC_3137
DSC_3138 DSC_3139
A simple 2 channel universal charger from Golisi.
DSC_3103 DSC_3104 DSC_3105 DSC_3106
It arrived in a cardboard box, with some specifications on.
DSC_3133
Inside the box the charger was in a pouch.
DSC_3134
The box included the charger, a mains cable, a pouch and the instruction sheet.
DSC_3140
The charger has universal mains (110-240VAC 50/60Hz) and a 12V input on the back.
DSC_3141
The user interface is two bars of 3 leds showing the charge state. When charging one led will flash and all will be lit steady when batteries are full.
DSC_3761
One slot is rated for 2A charge current, the other for 1A.
DSC_3760
The charger do also support power bank function.
DSC_3142
On the bottom of the charger there are specifications.
DSC_3143 DSC_3144
The slots uses the classical slider construction and it works fine.
The slots can work from 32mm to 70.5mm. This covers unprotected batteries, but some protected will be too long.
supportedBatteryTypes
supportedBatterySizes DSC_3202 DSC_3203 DSC_3204
DSC_3206 DSC_3207 DSC_3208 DSC_3209 DSC_3210 DSC_3211 DSC_3212
The charger can handle 70 mm long batteries including flat top cells.
The charge current for 1 cell is 1A when using #2 slot or both slots, this is rather high for small cells.
Measurements


  • Discharge LiIon battery with 2mA when not connected to power.
  • When power is connected with a full battery, it will charge with about 0.6mA.
  • Below 1.5V the charger will assume NiMH
  • Above 2.5V the charger will assume LiIon.
  • A slot with a battery will not increase current when other slot is finished (Good).
  • A single LiIon in is charged at 2A in slot #1.
  • Two LiIon is charged at 1A
  • A single NiMH is charged at 1A in slot #1.
  • Two NiMH is charged at 0.5A
  • Charger will not restart when voltage drops.
  • It will restart charging on reinsertion of the battery or power cycling.
  • Power consumption when idle without battery is 0.18 watt.

Charging LiIon
Golisi%20O2%20%28SA18650-33%29%20%231
Slot #1 will charge with 2A when it is the only used slot. The curve is a CC/CV with about 140mA termination.
Golisi%20O2%20%28SA18650-33%29%20%232
Slot #2 is always 1A and also with a CC/CV charge curve and 140mA termination.
Golisi%20O2%20%28SA18650-26%29%20%232
Golisi%20O2%20%28PA18650-31%29%20%232
These two cells looks fine.
Golisi%20O2%20%28BE18650-26%29%20%232
I wonder why the current jumps up and down on this cell, I tried twice and the curve looks similar. It do not prevent the charger from charging the cell in a reasonable way.
Golisi%20O2%20%28AP18650-26%29%20%231
This high current cell is charged fairly fast in the 2A slot.
Golisi%20O2%20%28SA20700-30%29%20%231
The same with this larger cell.
Golisi%20O2%20%282xSA18650-33%29
With two cells in the charger the current is reduced to 1A for both slots.
Golisi%20O2%2012V%20%282xSA18650-33%29
When powered from 12V it needs about 1A to charge two cells.
Temp6128
M1: 37.7°C, M2: 38.6°C, M3: 54.1°C, M4: 51.5°C, HS1: 69.6°C
Temp6129
M1: 48.0°C, HS1: 69.1°C
PoweronLiIon
The charger needs about 3 seconds to start.
Voltage%20Sweep%200-4.25V%20%231
The charging profile with both NiMH and LiIon charging for slot #1.
Voltage%20Sweep%200-4.25V%20%232
Slot #2 is similar, but at half the current.
Charging NiMH
Golisi%20O2%20%28eneloop%29%20%231
The charger chargers with 1A and uses voltage termination on this cell, but without any top-off charging.
Golisi%20O2%20%28eneloop%29%20%232
In slot #2 the current is 0.5A and the termination also looks to be on voltage.
Golisi%20O2%20%28eneloopPro%29%20%231
The same with the larger cell.
Golisi%20O2%20%28leise25%29%20%231
This cell has lower voltage and termination is on -dv/dt.
Golisi%20O2%20%28eneloopAAA%29%20%231
Again voltage termination.
Golisi%20O2%20full%20%28eneloop%29%20%231
The full eneloop is detected in about 6 minutes.
Golisi%20O2%20%282xeneloop%29
With two NiMH cells in the charger the current is 0.5A for each.
Golisi%20O2%2012V%20%282xeneloop%29
The charger needs about 0.2A from 12V to charge two NiMH.
Temp6170
M1: 32.2°C, M2: 31.6°C, M3: 38.0°C, HS1: 40.0°C
PoweronNiMH
NiMH needs about 3 seconds to start.
ChargingNiMH
As usual NiMH charging will check the voltage with current turned off.
USB output


  • Discharge LiIon battery with 2mA when not connected to power.
  • Usb output will not drain batteries below 3V (Current draw is below 1.5mA)
  • USB output is coded as DCP
  • USB output is on even with a very small load on usb output.
  • USB output will drain the batteries to 3V .
  • USB output turns off when charger is powered.

Golisi%20O2%20%231%20load%20sweep
The USB output can deliver 1A before it starts to drop, but there is no real overload protection.
Golisi%20O2%20%232%20load%20sweep
Using #2 slot to power the usb is the same.
Golisi%20O2%20load%20sweep
And also with both slots at the same time.
Golisi%20O2%20usb%20out%2010ohm%20%28SA18650-33%29%20%231
With 0.5A load the output is stable for about 3 hours, then it drops some, but do not turn off. The usb output will run for a long time with nearly no output voltage, instead of just turning off. Battery will not be discharge below 3V, but to 3V.
The USB output makes a weak high frequency audible sound, especially when the batteries are low.
Golisi%20O2%20usb%20out%2010ohm%20%28SA18650-33%29%20%232
Using slot #2 works the same way.
Golisi%20O2%20usb%20out%2010ohm%20%282xSA18650-33%29
With both slots the time is doubled.
Note: The efficiency curve is wrong because I only measure on one battery.
Golisi%20O2%20usb%20out%205ohm%20%28SA18650-33%29%20%231
At 1A output current it drops earlier.
Golisi%20O2%20usb%20out%2010ohm%20%282xSA18650-33%29
The output is nicer with two batteries, but it will drain the battery to 3V.
noOhm
With no load the output goes a bit up and down, the noise is 35mV rms and 437mVpp.
10ohm
At 0.5A the noise is 35mV rms and 432mVpp.
5ohm
At 1A the noise is 58mV rms and 701mVpp.
Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.
Conclusion
This charger is very simple to use, you just have to put the batteries in, this also means that current selection is fairly limited. With LiIon you can select between 1A and 2A for a single cell, depending on slot. With 1A being the minimum LiIon current this means the charger is bad for small cells.
The usb output works fine with two batteries in the charger, but has problems with full current on one battery, but I do not like the way it drains the batteries to 3V, it would be nicer if it turned off and stayed off first time the output got too low.
I will rate it as a good and simple charger, but the usb output could be better.
Notes
The charger was supplied by Golisi for review.
Here is an explanation on how I did the above charge curves: How do I test a charger

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/