Here's an 16GB (actually it's 32GB!) iPhone 6 that I purchased from eBay UK for £16 GBP. The seller listed it in the spares/repairs category and described it as "not charging." After recently repairing my mum's iPhone 4S with the exact same issue, I strongly suspected that it just needed a replacement battery - my suspicions were correct because once that was taken care of, it returned to life. 
The iFixit guide made this task look far more complex than it actually is. Admittedly, excising the old battery was the hardest part - due to the sheer amount of adhesive used and I had to be extremely careful because the rear casing appears to be rather fragile but once that phase was completed, it was plain sailing. Even with the cost of a new battery, a paltry £7 GBP, this is an absolute steal because on eBay UK the average price for this model in good condition is around £80 to £90 GBP.
The iFixit guide made this task look far more complex than it actually is. Admittedly, excising the old battery was the hardest part - due to the sheer amount of adhesive used and I had to be extremely careful because the rear casing appears to be rather fragile but once that phase was completed, it was plain sailing. Even with the cost of a new battery, a paltry £7 GBP, this is an absolute steal because on eBay UK the average price for this model in good condition is around £80 to £90 GBP.

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