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Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
I have recently came accros 528 9V pile aklkaine batteries, and was wonder what to do with them any ideals? i could make a big battery, or string them all to gether and make a 4.5KV battery.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
you can't series more than a few of them. batteries have an internal resistance which generates heat. more batteries in series=more heat. 9v batteries are even worse because they are made from 6 individual cells already placed in series. i'd keep like 100 of them and donate the rest to a robotics club or something.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
For a given power the losses will go down with increased voltage because the current will be lower. With a given current the losses will be the same per battery so worst case is that you waste the same precentage.
If you make a high voltage battery you need to be very careful with it because it will be really dangerous, that includes adding a few fuses so you don't short it and start a toxic fire inferno.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Do the packages permit them to be snapped together to make series strings?
In such a string, the total voltage, internal resistance, and power capability go up in direct proportion to the number of cells. (number of 6-cell units). Internal heating per cell is constant for a given current. 100 mA is a pretty heavy load for 9V alkalines, and will deplete them much faster than you would figure from their nominal mAh rating.
But 13 cells would give you nominally 117 volts when fresh, and could easily run some 120V night lights or Christmas lights. Beware of shocks.
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
I found them an a junk yard they where in unopened case, but after going though about 100 of them only 5-6 arr <8V most of them are 3V~6V i think they are quit old some are blowted, i might just sent them to a recycling center, or exract the all the Mn02 out of them
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
pauleddy wrote ...
I found them an a junk yard they where in unopened case, but after going though about 100 of them only 5-6 arr <8V most of them are 3V~6V i think they are quit old some are blowted, i might just sent them to a recycling center, or exract the all the Mn02 out of them
ahhhh no wonder.... i've got a 9v battery from 2001 and it still has 6.45v in it. 2 years ago,i got bored one day and did an experiment where I took a fresh 9v Energizer to power a small 3mm red LED in series with a 470k resistor. Im surprised to see the led still glowing today. thats roughly 17,520 hours!!!
Registered Member #3989
Joined: Thu Jul 07 2011, 05:10PM
Location: In a van down by the river.
Posts: 52
haxor5354 wrote ...
ahhhh no wonder.... i've got a 9v battery from 2001 and it still has 6.45v in it. 2 years ago,i got bored one day and did an experiment where I took a fresh 9v Energizer to power a small 3mm red LED in series with a 470k resistor. Im surprised to see the led still glowing today. thats roughly 17,520 hours!!!
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
mabe i will buy a bunch of LEDs and resistors and make some form of glow art or somthing like that i have gon though a few more case there voltages are pretty random right know im sorting them in to piles of <8V 3v~7V and >3V i found dates on the boxes some are from 2003 and others are from 2006
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528 9V batteries
