I've gone away from the spare phone battery thing and bought a battery pack to charge from, I got a Anker Astro3E 10000mAh job (imported for ~$70) which is probably overkill but I can get 4 charges from it from flat. Has the benefit of if I change phones I can just use the same pack and also I don't need to pull the back of my phone off which can be a bit of a front bum as it's got o-rings etc to keep it waterproof.
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