@shama good point, but these are prefab and my skills of handworking are realy poor :D

i have that idea too, but i dont want to have a hole in the cover... :)

i dont think it help...
Here is a picture of the battery with almost visible antenna, compared to size of USB and NFC Ring
and here is one picture with the silicone battery cover...

Yes.. the problem is in Antenna... I've tried my rings on NFC enabled phones of my coworkers and they worked very well...
like with my S3 with original battery...

The Rings itself are very comfortable, but their usability isn't...
I just want grab my phone to unlock
I'm using "NFC LockScreenOff Enabler" Xposed module to unlock my phone.

And i know, that these tags working differently than standart tags, but my other tags are working even 1cm far from phone independently from "Sweet Spot"... just somewhere around the Antena...
These rings are working in one of fifty attempts... (without battery cover in 1 of 10) mostly from "succesfull" attempts i've get "NFC lost" toast message (Alpha work better - about 1 of 30 with cover)
and this is really different from what i've expected and i'm little dissappointed...
it's really uncomfortable to riding with the ring around back of my phone, when its faster to unlock by passcode...

I'll try it yet with my Nephew's Nexus 7 if the ring works correctly and will see, what to do next... Maybe it's really only ZL-Battery issue...

Edit: without battery cover it took 5 second to recognise the standart ring holding still aligned with antena...
and with that, i've found one funny thing with this Xposed Module... it unlock even with "Tag Lost" message, because it read TAG ID to authorise instead of written data's...

Hello,
my Rings arrived today (not the Stealth Bomber, but normal Rings)... Two normal ones and one Alpha ring..
They work well with the original Samsung battery, but they need to be placed precisely about 1,5 cm under the Samsung logo (Both normal and Alpha).

I have these problems with the "ZeroLemon NFC Enabled 7000mAh" battery:

• I can't find any sweet spots with the cover on - Alpha Ring works everytime at different places, but not twice at the same one... I have succeeded with normal ring only once.

• Without the cover the sweet spot is directly on both sides of the battery (the Battery has a visible large antenna, which is from side to side in the size of a standart Samsung Battery).

Other tags (Samsung TecTiles, some no-name Mifare tags from eBay, even the Credit Card) and spare tags from this package are readable very well even with some money under the battery cover... But Rings won't work...

Hello,
as i know, Galaxy S3 have NFC antenna inside the battery. And in battery area working perfectly with all of my NFC tags..
Sadly, i don't have my NFC Rings yet, because i'm waiting for delayed "Stealth Bombers". (Two classic and one Alpha)
So... When they arrive, i'll let you know where is a sweet spot on 7000mAh ZeroLemon batteries :)