-
They all output the same voltage so you need to look at capacity. For example most of the solar storm batteries are rated at something like 4000 mAh. Though I suspect they are much less than this, Anker have a good reputation, a 10, 000 mAh is a big lump but obviously holds a significant amout of power.
http://www.amazon.co.uk/Anker-10000mAh-Portable-External-Technology-Black/dp/B0063AAIRG
freezing77-
Cool thanks for that, are they waterproof though if I am gonna strap it to the bike?
-
They all output the same voltage so you need to look at capacity.
The cells all output the same voltage, but packs and banks don't.
Anything using USB should be 5V ± 5%
I've got a few MS808 clones, all using 4-cell packs but half are 2S2P (8.4/7.4v, 4400mAh), half are 1S4P (4.2/3.7v, 8800mAh). 3.7v pack into a light that expects 7.4v, you should get a low battery indicator and it probably won't output anything, especially if it has a low-voltage dropout feature. With a 7.4v pack and a 3.7v light, if the circuit doesn't go pop and there's no overvoltage protection, the buck driver should be able to run a reduced duty cycle and you'll get light, but the low-voltage dropout will never kick in and you'll be in the dark with a knackered battery.
I bought an Anker Astro3E a few years ago, can't remember where it is any more. The 10000mAh capacity is internal, at the cells' voltage, so it either has 5 cells or 4 "high capacity" cells whose stated capacity may or may not be accurate. 10Ah @ 3.7v = 37Wh = 7Ah @ 5.25V (minus conversion losses and with total output over time inversely correlated with current draw)
jv
Emyr
Ok thanks so what battery pack would I need for the solar storm 2 cree xml u2 or the xml t6? Any links ? Sorry for all the q's I don't know much about this stuff