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Hi Wendy,

I'm afraid I don't think it's do-able on your budget.

My iPhone uses 1.5ah to charge and the iPad 7ah, so that's 8.5ah to charge just those two. If you have multiples over multiple days then you'll see you need a pretty big battery to cope!

I have seen these units recommended on here, and you could get two for your budget but even then would still only have 20ah of power to play with.

Have you seen the power pack I recently made to charge my appliances whilst camping? This would be outside your price range at around £140 but could be used for so much more than just charging a couple of phones - water pump, lighting etc etc. You could even add a solar panel for £25 and it would keep the battery charged :)

Kevin

Check out the Anker range of portable batteries.  I am going to a festival and buying the Astro E5 which is £38 - it will charge my phone around 8 times on one charge of the battery

http://www.ianker.com/support-c1-g228.html 

If that isn't suitable they do have alternatives

Hi Wendy - Just an update on how I've got on so far. My charger arrived on Tuesday.  It was already charged up on arrival, and so far it has fully charged my Galaxy S3 four times and still has juice left in it.  It looks like it will certainly do the job for me.  Keep us posted on what you go for and how you get on. :D

p.s. It charges the phone up as quickly as a usual plugged in to electric charge would.