| EEVblog > EEVblog Specific |
| EEVblog #751 - How To Debunk A Product (The Batteriser) |
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| mikeselectricstuff:
--- Quote from: AndyC_772 on June 07, 2015, 06:51:58 am ---Do we have any idea what the quiescent power consumption of this dc-dc converter is meant to be? It needs to maintain 1.5V not just into a heavy load, but also a very light one. Most battery powered devices spend most of their time switched off, or at least, in a standby mode where their consumption is microamps. Draw more than a few uA when the device is off, and you're doing more harm than good. The marketing, and perhaps the application itself, isn't doing justice to what could be some genuinely worthwhile technology. Perhaps they do indeed have a notably efficient, small dc-dc converter, which is cheap, robust, and has extremely low standby power use? That in itself is a really useful piece of technology, just not for use in this particular product. --- End quote --- Based on common devices, likely to be somewhere between 5-20uA, but this will be drawn at the output voltage, so scale this by the step-up ratio & efficiency If we say 30uA, this represents roughly 80Khrs, about 10 years. Of course some devices will draw some current in "off" mode for various reasons, so "shelf" life would be reduces, but for AAs upwards, probably not enough to be a major issue. |
| mcinque:
--- Quote from: EEVblog on June 06, 2015, 02:01:46 pm ---It is not a scam. --- End quote --- Legally here the word "scam" is used to describe something that makes you obtain an advantage by using artifice and deception. Telling that a product does something huge (while it does not) only to obtain an advantage (to have your crowdsourcing campaign funded, for example), technically and legally, here it's considered a scam. Of course you're right: there's nothing new in this kind of marketing, we can see this "technique" used in every single country of the planet, but this 800% improvement is a little bit cheeky, don't you? :) |
| mikerj:
--- Quote from: Wytnucls on June 06, 2015, 10:51:59 am --- --- Quote from: Mr Simpleton on June 06, 2015, 10:41:23 am ---Running a battery at 100 mA and 1.5 volt down to say 1V then put the gizmo on... means you will take 150 mA (in a perfect world) out of the poor battery, which is depleted already. With increasing Ri this thing will go down hill real fast :-DD --- End quote --- Wrong. Look at the most efficient constant power curve of the Duracell AA battery. There is no significant time curve dip below 1V, down to 0.7V. The internal battery resistance doesn't increase until below that voltage. --- End quote --- At constant power the voltage is pretty much in free-fall by the time it's hit 1v, even for fairly small loads. |
| Wytnucls:
The curve published by Duracell for 100mW is much flatter and goes below 0.8V. At 1V, the load will draw 100mA and 170mA at the claimed 0.6V threshold, to maintain that power. 10 to 20% battery life extension seems plausible at that power level. |
| MrAl:
--- Quote from: Poe on June 06, 2015, 06:29:35 pm ---So my camera eats a new battery every eight minutes. I put this on a dead battery get an hour of run time? That's what they're saying right? --- End quote --- Hi, That is what it is SUPPOSED to do, but there are too many unanswered specifications we still dont know yet, like the max current output for the Battery Thingizer. Cameras need a decent amount of current, and it is not known yet if the new device can put out the required current that the camera would need. Typically i think some cameras could benefit from a product like this, but only if it is able to put out enought current to satisfy the needs of the camera. Right now because of the required size of the new device (that must fit over an AA cell and be able to still fit inside the battery compartment) it is very doubtful that it can work with high current devices, even when that current is just a pulse. So it may only work with low current devices like remote controls, which may not really need the device anyway. We have to wait and see what happens when someone gets one of these and tests it since the company that makes them only publishes specs they want you to know, and dont publish any specs they dont want you to know. |
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