5V SLA Portable Recharging Station
thingiverse
I have what you need: a 12V 7Ah SLA Battery, a 12V-to-5V voltage regulator, and a micro B USB cable are required. Hopefully your voltage regulator can handle this configuration - Most 12v 7AH sla batteries will fit, as mine measures 150mm x 65mm. Check out the following products to make sure you have everything: SLA Battery: www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=12v+7ah+sla+battery&rh=i%3Aaps%2Ck%3A12v+7AH+sla+battery Voltage Regulator (this may require modifying your compartment) - www.amazon.com/KEEDOX%C2%AE-Converter-Power-Supply-Module/dp/B00A71CMDU/ref=sr_1_7?s=electronics&ie=UTF8&qid=1416421873&sr=1-7&keywords=5v+voltage+regulator My calculation tells me that you should get 10 to 12 full charges per SLA battery cycle.
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