You can perform a Raspberry PI stresstest with the sysbench tool.
First example calculate primes
sysbench --test=cpu --cpu-max-prime=20000 run
Second example test the I/O Output of your Raspberry Pi
sysbench --test=fileio --file-total-size=2G prepare
sysbench --test=fileio --file-total-size=2G --file-test-mode=rndrw --init-rng=on --max-time=300 --max-...
Yes, most (but not all!) USB power banks are capable of powering a Raspberry Pi, since they usually have an output voltage of 5 V. And yes, by using a (quite large) 50 Ah power bank, you can definitely expect your Pi to run for at least 24 h. See the long answer below for reasoning and further relevant aspects.
According to actual ...
The Pi has no inbuilt current or voltage sensors which could be used for monitoring its own current draw, or a battery supply. You will need to track down a multimeter or other measuring device (this type of thing is very common) to keep track of your power consumption.
The Pi 3, while idling, consumes about 220 mA. Under loads, it is known to reach up to 1 A, and with USB devices plugged in, it can reach 2.5 A. There is no on board current sensor, so this is only a tool for a good estimate.
I wrote the little command-line tool stressberry the other day which stresses your Raspberry, measures the core temperature, and produces nice plots. Install with
pip install stressberry --user
and run with
stressberry-plot out.dat -o out.png
I took a quick look at some light and powerful lithium polymer batteries, and it looks to me like a battery similar in scale to the Zero is not going to provide much capacity. Let's keep in mind that the computer only weighs 9 g. A LiPo of similar size  contains a about 1.3 W*h of energy, which won't power the Pi Zero for a full 3 hours, even idle.  To ...
vcgencmd will show the internal voltages for core, sdram_c, sdram_i, and sdram_p:
vcgencmd measure_volts core
The output will look something like this:
The following shell commands will display all the voltages:
for id in core sdram_c sdram_i sdram_p
echo -e "$id:\t$(vcgencmd measure_volts $id)"
Absolutely DO NOT connect the battery in parallel with the load. The charger will not know if the battery is full or not and will continue to pump power both to the battery and the step-up converter.
Since the battery is still receiving power and is still charging, it will overcharge and explode.
If you want to do this properly, you should use a proper ...
you'll need some external circuitry to do that, because afaik the raspberry does not provide the battery voltage anywhere in the system: http://raspi.tv/tag/raspberry-pi-monitoring-its-own-battery-voltage
The pi can't draw more than 1A due to a fuse stopping the board drawing more than that. So how big a battery you need really depends on how long you want it to run. If you have a 500mAh battery, that will output 500mA (0.5A) for one hour, or 1000mA (1A) for half an hour. Similarly, a 2000mAh battery will give you 2000mA (2A) for one hour or 1000mA (1A for ...
As long as the power bank outputs 5V it will power the Pi.
It claims 50000mAh so it claims 2.5 amps per hour for 24 hours. Assume it will deliver half that so 1.25 amps for 24 hours.
If that is enough or not will depend on what you have connected and what the Pi is doing.
Yes, should do
Just double checking the datasheet of the MT3608:
if using AA rechargables instead of batteries, mind the lower voltage (cell voltage 1.2 V), but for two cells in series still above the lower lockout voltage (2 V) of the MT3608
at very low input voltages the efficiency could be lower than 80 %, the datasheet (p. 5) lists 80 % at 3 V and a ...
Either would power the pi and your peripherals. The pi could draw between 0.5A and 1A (depending what camera and how much wifi), so the 4Ah battery should last 4 to 8 hours and the 10Ah battery 10 to 20 hours. Choose the one which gives you the duration you want, or a smaller or larger as required.
A standard 9V non-rechargeable PP3 has a high internal ...
9V battery has about 500mAh, since your Pi consumes about 700mA, you're looking at run times about 40 minutes, more or less depending on the type of the battery (a good quality panasonic industrial type has 570 mAh.. low end type probably more like 400).
running Pi with 9V battery and a linear voltage regulator is very inefficient, you basically turn almost ...
The batteries won't force current through the system. Your bigger problem, though, will be running the Raspberry Pi 2 at all on 4.8 V. It's very close to under-voltage warning (which I saw quoted as 4.65V for the B+). You'll need some kind of DC-DC converter to get the voltage to consistently ≥5V.
You can use:
A USB battery pack like this one from Adafruit.
Others have used powerbanks like this one these allow charging the battery and powering the Pi simultaneously (more info on using these can be found here).
You could use 6 AA rechargeables (this may require additional components).
A desktop UPS (this will be significantly bigger than the other ...
The problem was that there was no ground between the L298N and the Raspberry Pi. By wiring the Ground (-'ve) terminal on the L298N to a ground pin on the Raspberry (as well as the batteries) it then worked.
Many of my contributions to this forum have centered around innovative ways to power a Pi which is awkwardly out of reach of a mains socket, specifically using POE. But what do you do if there's no mains power source at all, ie: Pi used in off-grid conditions or mobile use where the Pi is not stationary?
As the Pi 4 now had a USB-C Power socket, I ...
In the scenario of a USB power pack, you'd have to add a circuit to the Pi that monitored its own voltage, e.g. through an ADC (analogue-to-digital converter). This would give you the capability to estimate when battery was low enough to trigger the internal power pack cut-off. A simple service running in the background would check the voltage every few ...
It outputs current at 800 ma/h
I think this measurement/units are wrong. Amps are defined as Coulombs/s. So your current cannot be 800 mA/h. Your output current is 800mA. You can give a measure of the energy hours stored in the battery using a unit like A*h. But I digress...
What matters here is the output current, I think as long as you're close to 1Amp ...
Rechargeable powerbanks are great for this. They are made to recharge mobile phones, so they have standard USB output. I use them in a few of my projects with different Raspberry Pis including the Zero. The size really depends on how long you need it to stay on battery power. For reference, the Zero uses about 200mA max, so if you want it to run for 10 hours,...
XBMC doing multimedia decoding might be a good test as well as the UI there is in OpenGL. A game that constantly hammers the frame buffer (memory!) while including a numerical simulation like OpenTTD is also a pretty good test. The generic Dhrystone and Whetstone benchmarks might also be good. There's an OpenGL game I'm working on porting called Armagetron ...
Verified battery packs are already mentioned in the Wiki. Similar topic is covered by these links:
Something to keep in mind is that some power packs will shut themselves down if there isn't enough of a power draw. For example, I have a New Trent PowerPak+ 13500mAH power pack, which shuts itself off after a couple minutes if it's only powering an Arduino or Raspberry Pi. (Plugging in my hungry smart phone prevents this)
Any USB power pack will certainly ...