From my testing with other gadgets I reckon 5 days to a week would be right on 
the money for the Pi, they run on the smell of an oily rag when it comes to 
computer power.

> On 21 Sep 2016, at 7:32 AM, Travis Siegel <> wrote:
> I want to get one of these, and rig it up in a case of some sort with my 
> raspberry pi.  I wonder how long it could power the pi.  Someone I saw online 
> built a laptop into a case, and used a battery similar to this one, and it 
> ran for about 2 days off of one charge of this battery.  I'd have to think 
> that the pi would be good for a week or more on a single charge of such a 
> battery.  I really need to look into getting meone of these things.  I use a 
> power juice now, and it will run my pi for about an hour, which isn't a whole 
> lot, but it's enough when I need to be away for just a little while, and 
> still need access to a machine.
> On Fri, 16 Sep 2016, Dane Trethowan wrote:
>> Review: RAVPower RP-PB14 Xtreme ? The Last Portable Battery You?ll Ever Need?
>> August 27, 2014
>> RAVPower RP-PB14 Xtreme
>> I?m starting to think I might have a problem. My interest in external 
>> batteries
>> may be turning into a fetish, but these energy stores are important to our
>> digital lifestyles. The latest electron pump to whet my appetite is the
>> RAVPower RP-PB14 Xtreme.
>> Xtreme is a clue to this units performance, this is one meaty power pack.
>> Weighing in at over half a kilo and with dimensions of 18.5 cms x 12.4 cms x
>> 1.8 cms, this isn?t going to fit in your pocket. But its huge capacity is its
>> advantage and it?s still small enough to fit in pretty much any bag.
>> The 23,000mAh 5v output will, for example, fully recharge an iPhone around 12
>> times, a Galaxy S4 around 7 times and even an iPad Air from empty to full
>> twice over. In addition the battery can output a range of higher voltages to
>> power netbooks, notebooks and laptops too.
>> The Kit
>> As well as the battery itself, the kit comes with 4 charger tips for mobile
>> devices (Samsung, Nokia, mini and micro USB) as well as 2 x USB power leads,
>> plus a range of 10 charger tips for laptops (see below) and a DC lead to hook
>> them up. There?s also a felt carry case to pack it all into.
>> RAVPower RP-PB14 Xtreme Kit
>> Feel the Power
>> The little LCD screen gives the unit an air of quality and shows the 
>> remaining
>> power level of the cells (both visually in bars as well as a percentage
>> value). In addition the USB symbol appears when charging through either of 
>> the
>> USB ports.
>> RAVPower RP-PB14 Xtreme LCD Display
>> The upper aluminium body (plastic bottom half) helps with heat dissipation 
>> and
>> there are 4 ports along the top edge of the case. From left to right, first 
>> is
>> the input port, this is used to charge the battery from the supplied AC Mains
>> charger (15-24v 2A) which will work around the world as it?s 100-240V 
>> 50-60Hz.
>> It takes around 6 hours to fully charge.
>> RAVPower RP-PB14 Xtreme Ports
>> Next along is the USB 2 port, this is a 2.5A output that will charge an iPad
>> at full speed as well as those other power greedy devices like the Galaxy Tab
>> or Nexus 7. The USB 1 port is a standard 1.0A output for your iPhone, Android
>> smartphone, Portable Game Console etc. Finally the right-most port is the DC
>> Output for charging laptops and notebooks. 
>> Check the AC adaptor for your laptop to determine the voltage required, then
>> hold down the single function button until the voltage value begins to flash.
>> Press the button again to cycle through the output options (9, 12, 16, 19 and
>> 20 volts). Once you arrive at the correct value leave it flashing for a few
>> seconds and it will stop and lock to that output.
>> Apple Magsafe Cord / CableThe 10 notebook tips included in the kit will
>> connect the battery to most units from Acer, Asus, Benq, Dell, HP, Lenovo,
>> Samsung, Sony and Toshiba.
>> Being a MacBook household there?s an obvious omission from that list, no 
>> doubt
>> because of Apple?s proprietary connector. However a quick search turns up 
>> these
>> inexpensive Apple Magsafe and Magesafe 2 cords so it may be possible to rig
>> something up for your Cupertino computer. But plug any Heath Robinson
>> contraption into your shiny, expensive MacBook at your own risk.
>> You can use both USB Smart Ports at once (3.5A max) and even simultaneously
>> charge 3 devices by adding your laptop at the same time (4.5A max total
>> output). The instructions allude to an 80% efficiency stating that the unit
>> will ??consume about 20% of the total capacity, including power loss from 
>> circuit
>> heat and voltage conversion?.
>> RAVPower say the Lithium-Polymer cells employed by their unit are more stable
>> and safer than Li-ion and they are good for over 500 recharge cycles. They 
>> are
>> keen to point out the other safety features of this unit too and quote
>> protection for overcharge, overvoltage, overcurrent, overtemperature and 
>> short
>> circuit with auto-shut down where required. In normal use the unit will auto
>> power off between 5 and 20 seconds after its been disconnected.
>> Bottom Line
>> We recently packed the RP-PB14 on a long family car journey and even though
>> there was USB power available in the car, the rear seat passengers preferred
>> to use the battery as it meant those (short) lightning and micro-USB cables
>> weren?t as stretched and restrictive as they were when plugged into the car
>> adaptor.
>> The enormous capacity of the RAVPower unit would be especially useful on long
>> flights. Although I?ve noticed there?s an increased risk of being pulled at
>> airport security these days with a battery in your hand luggage. I?ve been
>> stopped at the X-Ray on 4 out of the last 4 flights I?ve taken so they could
>> take a closer look at this smaller battery.
>> <br /> 
>> My daughter can seemingly drain any smartphone battery in just a few hours 
>> and
>> as she?s starting university in a few weeks this is going to be the perfect
>> device for her backpack. Popularity with her fellow IT students should be
>> assured too when word gets out that she?s packing a power source that?ll keep
>> multiple devices juiced-up throughout the day.
>> The RAVPower Xtreme is sturdy, high-capacity energy source that will see most
>> people through many days of travel, camping, power outage or whatever. If 
>> you?re
>> after a beefy battery that?s flexible enough to charge most modern 
>> electronics
>> then it?s certainly a worthy candidate for anyones shortlist. Available now 
>> for
>> around ?80.
>> **********
>> Those of a positive and enquiring frame of mind will leave the rest of the
>> halfwits in this world behind.
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