Efest Lush Q2 fast charger

19 posts / 0 new
Last post
torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow
Efest Lush Q2 fast charger


The Efest Lush Q2 is a fairly basic fast charger. It has led indication of full charge and fixed charge current. According to the specification, it will charge a single battery at 2A, 2 batteries at 1A. It will charge all of the battery sizes stated on the box:

The charger is powered by mains only:

With one battery, charge current was around 1.9A up to 4v, then it gradually drops. At termination, the battery voltage was 4.2v which dropped to 4.17v when the current cut off:

With two batteries, charge current was around 0.9A up to 4v, the batteries come out at just over 4.2v:

Edited by: torchythebatteryboy on 07/17/2017 - 14:30
torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow
If you want to try the Lush Q2, just follow Torchy on twitter: @TorchyUK , I’ll send a charger to a follower picked at random.
HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark

I wonder how you do your current/voltage charts. My curve do not look exactly the same:

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

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

That’s interesting how the voltage on yours rose so steeply. I tested it twice with a singlr battery to make sure it wasn’t reaching the claimed 2A, and it looks like you got avout the same current. I use a Medusa Research Power Analyzer which saves the data as CSV file, then I import it into Excel to produce the graph.

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
That’s interesting how the voltage on yours rose so steeply. I tested it twice with a singlr battery to make sure it wasn’t reaching the claimed 2A, and it looks like you got avout the same current. I use a Medusa Research Power Analyzer which saves the data as CSV file, then I import it into Excel to produce the graph.

I use an electronic load and inject a small current (<1mA) to secure the voltage will raise.

I did also try with a LiFePO4 cell (Only for a short time) and my usual current sensing equipment:

As you can see on the curve the voltage is 1.8A at 3.2 volt

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

atbglenn
atbglenn's picture
Offline
Last seen: 4 hours 10 min ago
Joined: 07/29/2011 - 12:04
Posts: 4192
Location: Long Island, New York

I find it funny that Efest would name their basic charger “Lush”

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

With the singlr battery I found that as soon as the charge current stopped, the voltage dropped from 4.2v to 4.17v, confirmed with a fluke multimeter, but from your graph it looks like the terminal voltage is above 4.2v.

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

I wouldn’t use “Lush” as a name for any device. But it’s not as bad as the bike light that Xeccon decided to call Goatsucker ( I think that was a poor translation of vampire bat).

Barkuti
Barkuti's picture
Offline
Last seen: 34 min 20 sec ago
Joined: 02/19/2014 - 14:46
Posts: 1491
Location: Alhama de Murcia, Spain

atbglenn wrote:
I find it funny that Efest would name their basic charger "Lush"

Yeah, it'd been much funnier were they dubbed it PoS

 

Cheers Party

Copper is mine, copper divine!

Votes & comments: https://imgflip.com/i/1rwxix 

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
With the singlr battery I found that as soon as the charge current stopped, the voltage dropped from 4.2v to 4.17v, confirmed with a fluke multimeter, but from your graph it looks like the terminal voltage is above 4.2v.

It is not, but my injected current will increase voltage when the charger turns off (I need the injected current at the low voltages).

Here I have zoomed to match you range and it is easy to see that the voltage is slightly below 4.20V

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

atbglenn
atbglenn's picture
Offline
Last seen: 4 hours 10 min ago
Joined: 07/29/2011 - 12:04
Posts: 4192
Location: Long Island, New York
Barkuti wrote:

atbglenn wrote:
I find it funny that Efest would name their basic charger “Lush”

Yeah, it’d been much funnier were they dubbed it PoS


 


Cheers Party

lol!

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

I just checked it agai. It doesn’t reah 1.9A until just short of 3.7v

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
I just checked it agai. It doesn’t reah 1.9A until just short of 3.7v

As you can see above: My copy does, both tested with a electronic load and with a battery.

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

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

I only test how it charges a battery.

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
I only test how it charges a battery.

Most of the time I also limits my measurements to that, but there it is hard to get any measures below about 3.5V with a normal LiIon cell, the voltage raises fairly fast above that level.
This time I tested with a load and a LiFePO4 cell and they both gave the same result at lower voltages and it do not match your result.

And my regular charge curve also starts at about 1.9A, even when the cell voltage is below 3.6V

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

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

The voltage certainly rises fast fro low voltage. How frequently do you sample?

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
The voltage certainly rises fast fro low voltage. How frequently do you sample?

All my measurement are done at 1 second intervals. When I do the voltage sweep with the load it takes about 15 minutes because I do it in 0.01 volt steps and takes two measurements at each point.

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

torchythebatteryboy
Offline
Last seen: 5 days 15 hours ago
Joined: 06/15/2011 - 08:54
Posts: 177
Location: Glasgow

I’m sampling at 0.45 second intervals. If it was at 1 second, the voltage rise would look steeper.

HKJ
HKJ's picture
Offline
Last seen: 17 min 35 sec ago
Joined: 05/24/2011 - 12:23
Posts: 5214
Location: Copenhagen, Denmark
torchythebatteryboy wrote:
I’m sampling at 0.45 second intervals. If it was at 1 second, the voltage rise would look steeper.

Then it sound like it is the input filtering on you equipment we see, not the real values. My measurements are not depend on fast sampling, if I needed fast sampling I would have to write some other software for my DMM’s (Bench DMM’s can often sample fairly fast).

Or is it even more simple: You only have one point at the start of the slope and one point at the end of the slope, nothing in between?

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