Good day to you !
Ive only been vaping for a month, maybe a week or two longer, cant really remember now lol !
So bit of a noob vaper still but ive got two of the same looking batteries, i think their Ego-T batteries, it says Ego-T on mine but whether their genuine is not known lol !
Well i have the same problem, the metal part of the clearomiser gets REAL HOT - this ive noticed to be mostly because i am a chain vaper lol !
So ive now got 3 Clearomisers, once one of them gets a bit hot (Real-Hot lol) i change it for another and keep doing that till ive had enough !
I know this trick wont really do you much use whilst driving but when your not driving this will be the best thing to do ;-)
As a few other members have said, this heating up is somewhat normal, ive kinda realised its down to the design of these 'Clearomisers/Atomisers' and my ones kept DARKENING my ejuice really badly after only a month of buying brand new clearomisers (i think your using an Atomiser there in your pic !) and ive found out one possible reason after totally dismantling all 3 clearomisers...
From my own humble experience;
The wick and coil accumulates ejuice and burns it a little, probably from my excessive vaping, then a layer of burnt ejuice sticks to the coils... this keeps happening until the coils become so clogged that every vape produces less and less vapor and this is the time when i taste more of a burnt vapor than the flavour of my ejuice...
Here's a picture of the muck-coated coil: ( Click on Images to Enlarge ! )
So when the coil keeps burning my ejuice it darkens the ejuice in the clearomiser and within only a day's vaping i cant see through the clear clearomiser plastic shell anymore !
Heres the coils gently moved away from the centre of the wick:
So i cleaned the coil & wick really gently with loads of Isopropanol alcohol that i put into a spray bottle, kept spraying the wick and coil until the wick became clean and clear again and used a pair of straight tweezers to gently go between all the coils and loosen the muck from the coils:
Re-Assembled the coil into the head and put it all back together and now produces vapor nicely once again but noticed in a good few forum posts that the clearomiser/atomiser heads/coils either need replacing or a darn-good cleaning every 7-10 days !
Found this out to be quite true as the muck covered coils burn and darken my ejuice when they get as bad as my one shown in the pics above, i just dont believe that a head assembly should be thrown away so have now invested in some Kanthal Ribbon wire ( 0.3mm x 0.1mm ) and some 3mm glass fiber wick, both from ebay UK, and will be throwing away the crappy coils and haggard wicks that im currently vaping with !!
Ive just successfully made a new wick and coil with this stuff and the results are awesome ! only from 3 coils ( 3 turns of the Kanthal Ribbon wire around the 3mm wick ! ) vaping some very serious clouds now

!
Will post a how-to for the replacement clearomiser coils soon as i take some photo's of the next one i replace !
Oh but BEWARE of using this Kanthal Ribbon Wire - IT CAN BE SHARP AND CUT FINGERS SO ONLY USE TWO PAIRS OF TWEEZERS TO HANDLE IT !!!
Hope this helps!
PS, the attachment thumbnail is of the straight tweezers tip !
Resources:
Ejuice Samples Website ( Ordered here 3 times already, great selection of stuff )
But i found the 1.8mg Nicotine level from this place TOO WEAK and 2.4mg Nicotine just right for my chain-vaping lol !
https://www.........../shopping/default.asp
Idea from where i got the Kanthal Ribbon Wire from ( thanks sywagon ! )
http://www.e-cigarette-forum.com/fo.../409849-intorduction-info-kanthal-ribbon.html
Kanthal Ribbon Wire:
Kanthal Heat Resistance Ribbon Wire - 0.3mm x 0.1mm (0.011" x 0.004") - 5 Metre | eBay
3mm Glass fiber Wick:
Silica Wick Rope for E-Cig Atomizer Repair 3mm Glass Fibre Ego, TR 1600°C | eBay