ok here's the skinny on these things.
there's an influx of them, these lipstick chargers.
go on amazon and you'll find many like this
lipstick chargerit's the shape of a lipstick, usually it's 2600mAh, and costs between 9bucks to 15bucks
99% of them accept a micro usb to charge, and they have standard usb connecters to connect any device.
these will charge 1 iphone/galaxy s3 probably 1 and 1/2 times.
pretty much they are all the same, it's a big 1 cell lithium ion battery that has a tiny circuit board soldered on one end.
fancier models will have a flash light.
now if you want to charge an ipad(tablet)
you'll need at least 5000mAh, imo, also you have to look for the AMP output.
look for
1a and 2.1a
like this
10kmAh chargerthis will usually give you 2 ipad charges
plus these models will also have power indicators, telling you how much charge is left, some more expensive ones will have a LCD display.
if you need more power, just pay more, it's also heavier
i have a galaxy s3
i always leave with a spare fully charged battery in my pocket.
if i'm on a weekend trip, i'll bring the lipstick charger for more power.
if i'm on a longer trip i bring the 12kmAh charger.
also don't forget, you can buy (gaming device) usb chargers. my ds/3ds/psp are all usb charged, you can buy cables for like 5bucks each.
i paid 10bucks for my lipstick charger
and 25bucks for my 12k charger, both work fine.