I've just come up with a plan B, lol... my problem is being tied to one place to charge. So a portable USB charger that fits in my purse is a viable option. My question (and I can't figure out volts and watts, etc.) is: Is it safe to charge the Vision Spinners on a portable USB battery charger? Does it matter what volt watt output they have?
I don't know if a portable power pack will charge slower or not, but I've only used mine on passthroughs
I recommend
Amazon.com: Yubi Power YP840A 8400mAh Portable Power Bank Backup External Battery Charger for iPhone 3/4/5 and Samsung Galaxy 2/3 (Black): MP3 Players & Accessories
And
Amazon.com: Anker® 2nd Gen Astro3 12000mAh Portable Charger Backup External Battery World's-Fastest (4A Output) Triple-Port Shake-to-Wake Highest-Energy-efficiency Power Pack for iPhone 5S, 5C, 5, 4S, iPad Air, iPads, Samsung Galaxy Tablets, othe