| Electronics > Projects, Designs, and Technical Stuff |
| Batteroo testing |
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| EEVblog:
--- Quote from: FrankBuss on December 20, 2016, 10:24:20 pm --- --- Quote from: amspire on December 20, 2016, 10:09:28 pm ---Trouble is you will put the Batteriser on and get another 20 minutes and Batteroo will say - "See it works! Power from a dead battery." You will need to have a second flat battery that you use again without the Batteriser so you can compare. --- End quote --- No one ever doubted that it has a little benefit for some devices (but we'll see). The problem was the 800% claim, and how it works if it is used from the beginning with a fresh battery. --- End quote --- That's what I want to do in my spreadsheet, get a list of just how much improvement you get in a whole bunch of products. Their claim is not 20%, it's an order of magnitude more and that's the selling point "Only 20% of a battery's capacity is used" |
| max_torque:
Depending on many factors such as discharge rate, recovery time, specific battery chemistry and recovery time (ie how long you leave the battery without load before reloading it), you'll get a bit more run time with a "dead" battery, so make sure you do that test too, and take that time off the time the batteroo extends! |
| FrankBuss:
I'm preparing the automated tests for creating the characteristic curves for tomorrow. I thought I had a proper 0.1 ohm shunt, but all I can find is an old wirewound cement resistor. It says "R15 10%", so 0.15 ohm. I'll use this for the 100 mA to 1 A tests. For measuring the exact resistance, I used my SPD3303D power supply in constant current mode with 1 A limit and a BM257s to verify the current. Turns out the Siglent thing is pretty accurate, as you can see in the image below (too bad it doesn't have sense terminals for the voltage). Then I measured the voltage drop with my benchtop multimeter. Depending on where I measure it, it changes from 154.50 to 154.80 mV. Might need to solder some thicker silver wires to avoid this voltage drop, but I don't care about errors less than 1%, high precision measurements is a science of its own, will leave this to the experts. Even after some time the resistor gets barely warm. Now the voltage drop is at 154.24 mV and doesn't change. So I can assume a resistance of 154.24 milliohm, which I will use as a calibration value when measuring the current with the initial setup I posted. Is this ok? Next I'll replace the 8x1 mux with a 4x2 mux, to switch both multimeter inputs as close as possible to the shunt and the uCurrent and do some tests with a voltage regulator module I have here, which has a efficiency graph in the datasheet, and my graph should then look the same. Then I can just connect the Batteroo instead of my test module, run the script again, and we'll have a curve in no time :) |
| EEVblog:
--- Quote from: max_torque on December 20, 2016, 10:44:17 pm ---Depending on many factors such as discharge rate, recovery time, specific battery chemistry and recovery time (ie how long you leave the battery without load before reloading it), you'll get a bit more run time with a "dead" battery, so make sure you do that test too, and take that time off the time the batteroo extends! --- End quote --- Yes, that was on my list. |
| ez24:
--- Quote from: FrankBuss on December 21, 2016, 01:31:05 am ---I'm preparing the automated tests for creating the characteristic curves for tomorrow. I thought I had a proper 0.1 ohm shunt, but all I can find is an old wirewound cement resistor. It says "R15 10%", so 0.15 ohm. I'll use this for the 100 mA to 1 A tests. --- End quote --- I like the train better and hope you will do it first. If you are not doing video you could take a dozen or so pictures (if the wheels do not wear out). I think the best use of these things will be in toys and these things will sell very well next Christmas at toy stores (if they work) |
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