Originally Posted by
PaulRivers
If battery life is a concern you can buy an external battery pack like this one for $30:
Amazon.com: USB External Battery Pack 20000mAh 5V/2.1A (Black Limefuel Lite LP200X) Charger with Flashlight for iPad, Mini, iPhone 6, 6+, 5S, 5C, 5, 4S, Galaxy S5, S4, S3, Note 3, Nexus 4, 5, 7, 10, HTC One, One 2 (M8), Motorola Droid, LG G2, G3, MOT
Cell phone batteries are around 3,000mah usually, this pack is 20,000mah.
This is going to much bigger than people will generally want to ride with. If you are only interested in keeping things running for a day, you don't need such a large battery.
The iPhone 5 battery is around 1400 mAh. The Edge 800 battery is 1000 mAh.
Originally Posted by
noglider
I bought this on your recommendation. I've only used it a little bit since buying it. So far, so good. But it is much bigger and heavier than I had expected. It weighs one pound! I might decide to buy a smaller one, maybe one third or one half the size, for when I don't want to lug a one-pound battery.
It's too big (for carrying around). It's a case of "but for the same money, I can get a much larger (and heavier) battery".
I bought a 5400 mAh battery. It's not bad to carry around but even it's bigger than I need.
Be wary about buying a big battery.