Just received another Manker E11 light, a cool white (CW) version this time. Previously bought a neutral white (NW) version.
On using an AA Eneloop cell, the E11 CW light didn't switch on despite trying the power switch several times!?
Removed the cell and checked the base spring and associated base contact and also checked the bezel contact for any dirt etc. The bezel contact looked a bit "dirty"(?) so I cleaned it using a cotton bud, and while I was at it, I also cleaned the base contacts and the body from any residue/dirt.
There was very little "dirt" cleaned off. Tried to switch on the light again, but still wouldn't switch on!?
I thought I had a faulty light now!
Tried another newer Eneloop instead of the first Eneloop cell (which was older and had lower charge), and this time the light switched on! I thought the first cell voltage maybe too low to run the light, so I recharged it.
I was able switch on the light with the newer Eneloop cell, select different modes and also able to (re)program light mode outputs (a long winded procedure!).
Switched the light off and put it down (gently) on a table. Picked the light up a bit later on to check it out again, and once again the light didn't switch on!!?? I swapped the "newer" Eneloop cell for another newer Eneloop cell, and again the light didn't switch on! I also recharged the newer cell (although it didn't really need it).
I knocked the light (gently) to check for a loose connection, and also tried cleaning all contacts again using cotton buds. But the light still wouldn't switch on!
I wound up recharging the second newer Eneloop cell also, but it didn't really need it (it was near full charge).
Swapped (fully charged) Eneloop cells into the light and somewhere in the process the light now decided to switch on and work! And as of now the light seems to be running OK without any further issue.
I'm beginning to suspect the issue may be due to the power switch as I had some problem with my first E11 here also.
It appears that after "working" the power switch to "break it in", the light now seems to work.
As mentioned in my linked post, the Utorch UT01 and to a lesser extent the Lumintop EDC05 lights had/have more serious switch problems according to various posts in forums, but very few (if any) have had switch problems with the Manker E11.
I'm beginning to wonder if Manker are now using different switches (compared to earlier runs) within the E11 as earlier E11 lights had no switch issues(?)