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Batteroo testing
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EEVblog:
I have one of these single AAA toy trains.
http://www.toysrus.com/buy/preschool-trains/imaginarium-power-steam-engine-train-set-5f5eedb-12595303
Will do the same test as Frank did.
Thought about getting two and running side-by-side but then people might complain the trains aren't identical. So will run two tests and then edit side-by-side footage with timer. Maybe add a lap counter?
Kean:
Frank, do you have some digital (or vernier) calipers?
If so, can you measure the thickness of the PCB material and the metal.
This is just for interest relating to fragility - as your first one clearly didn't last very long.
EEVblog:

--- Quote from: samgab on December 22, 2016, 05:19:26 pm ---Thanks for the Youtube video with the toy train Frank. Excellent real world demonstration, shows simply and beyond a doubt that there is no advantage - rather a disadvantage - to using the sleeves compared to a battery by itself. Looking at the train on the round track like a clock, you can even see that the train runs faster throughout the test with just the bare battery.
One simple real world test has utterly exposed the Batteroo as total bullshit.

--- End quote ---

And that's likely going to be very typical, if not pretty universal, for "passive devices" as Batteroo likes to clearly define in their products sheet
Now it's onto "Active load" devices like the Mp3 player and any other modern electronic gadget.
Batteroo have already admitted on their product sheet that it's not recommended with torches with DC-DC converters, why?, because they are active loads!
 :popcorn:
 


samgab:

--- Quote from: EEVblog on December 23, 2016, 04:40:05 am ---I have one of these single AAA toy trains.
http://www.toysrus.com/buy/preschool-trains/imaginarium-power-steam-engine-train-set-5f5eedb-12595303
Will do the same test as Frank did.
Thought about getting two and running side-by-side but then people might complain the trains aren't identical. So will run two tests and then edit side-by-side footage with timer. Maybe add a lap counter?

--- End quote ---

That'll be great, I look forward to it! It'd be a pretty simple task for you to put a little magnet on the side of the train and set up a simple reed switch and increasing count-up circuit with a display to show in shot the number of laps completed? That adds a very useful parameter to the tests.
amspire:
Frank,

Some tests you could do.

1. If the battery is 1.6V, it looks like the device acts like a forward biased silicon diode with about a 0.8V drop at 100mA. If it was 1v drop at 1A, that would be 1W dissipation which is a lot for that package on a very thin substrate.

You could actually test as the temperature coefficient is about -2.2mV/C. So if you attached 1.6V supply to the input with a 15 ohm resistor, by looking at the increase in output voltage over time, you can measure the die temperature. If the voltage across the resistor rises by 100mV as the chip heats up, you know that there has been a 45 degC temp rise in the die above ambient. The maximum rated temperature will probably be somewhere between 85 degC and 125 degC.

The point is that if a certain current raises the chip to 125degC with a 1.6V battery, that will probably define an absolute maximum current load that the Batteriser can safely be connected to.

2. If the battery is dead (ie replace the battery with a 20A range on a multimeter), what does the Batteriser look like on the output.
Is it an open circuit for both positive and negative applied output voltages?
Does it look like a diode for a positive applied voltage? Does it look like a diode with a negative applied voltage?
In both these cases, if it looks like a diode, what current is going through the battery (the 20A multimeter range)?

The point is that if something uses several batteries, then when the first battery with a batteriser runs flat, the voltage from all the other batteries will be applied to the dead cell/batteriser as a reverse voltage in series with the load.
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