Steve Marks Patent #06015476

[AhuraMazda]

You can make a small toroidal shaped lead acid battery and it would last 20 minutes to light a 60 W bulb too.
Of course you would need the inverter too.

[kames]

Here's a 9V battery, with the housing removed.  It's actually six AAAA batteries wired in series.  Handy if you run out of AAA and you have a 9V laying around.  They're a little smaller than AAA batteries but they work fine.  It's not hard to imagine 13 or so of these strung together fitting into the 6" TPU.

300mAh *13 = 3.9 Amp - Hours.
9*13 = 117 Volts.

You should be able to pull a full amp for 20 minutes before the batteries start to precipitously crash, according to typical discharge curves for single 9V batteries at 1 Amp.

@zerotensor

Open a book and read how to calculate the power when the batteries are connected in series.
Better, just test your idea and see that your calculations are wrong.

Kames.

[zerotensor]

@zerotensor

Open a book and read how to calculate the power when the batteries are connected in series.
Better, just test your idea and see that your calculations are wrong.

Kames.

It's gonna be a while before I have the extra cash to dump on a dozen batteries, but it will be done.

Check yourself, Kames.  Amp-hours is battery capacity, not power.  Say you have 2 batteries each rated at 500mAh.  That's 1000mAh you have total.  Attach a load that draws 1 Amp across one of the battery's terminals.  After about a half-hour, you will have drained all the juice from your battery.  Now, swap in the fresh battery.  We get another 1/2 hour of operation at 1 amp.  We see that the rating of the battery is a measure of how much energy we can extract, not power.  Twice as many batteries, twice as much energy there to extract.

You say this doesn't work if you connect the batteries in series.  I disagree.  The capacity doesn't go away no matter how you hook them up. 

OK, Kames is right, and I must have been smoking crack.  Thanks, Kames.

[kames]

@zerotensor

Open a book and read how to calculate the power when the batteries are connected in series.
Better, just test your idea and see that your calculations are wrong.

Kames.

It's gonna be a while before I have the extra cash to dump on a dozen batteries, but it will be done.

Check yourself, Kames.  Amp-hours is battery capacity, not power.  Say you have 2 batteries each rated at 500mAh.  That's 1000mAh you have total.  Attach a load that draws 1 Amp across one of the battery's terminals.  After about a half-hour, you will have drained all the juice from your battery.  Now, swap in the fresh battery.  We get another 1/2 hour of operation at 1 amp.  We see that the rating of the battery is a measure of how much energy we can extract, not power.  Twice as many batteries, twice as much energy there to extract.

You say this doesn't work if you connect the batteries in series.  I disagree.  The capacity doesn't go away no matter how you hook them up. 

Sorry, you really have to learn the basics.

PS: I just saw you posted your question in two threads. What for? Aleks answered your question correctly in another thread.

Kames.

[zerotensor]

PS: I just saw you posted your question in two threads. What for? Aleks answered your question correctly in another thread.

Kames.

The other thread was for my planned video replication.  After I posted it, some folks started talking about the same thing here, so I thought I'd join in the discussion.

OK, guilty as charged.  My calculation was totally wack.
I see where I got mixed-up.  You are completely right, of course, about the amp-hours of series-wired batteries.   I stand corrected and thanks for setting me straight.  I guess my only defense is to plead extreme sleep deprivation!  I was conflating the energy stored by the battery with its amp-hour rating, which is somewhat understandable, but totally wrong.

Anyway, even with only 300mA-hours, I should be able to squeeze out about 18 minutes at 1 amp.  A lot less overhead than I originally thought, but still possible.