9 Volts + 9 Volts = bang ! - Electronic Circuits Projects Diagrams Free

RODALCO · 1st May 2008, 09:38 AM

I had to replace two flat 9 Volt multi-meter batteries at work and decided to do the following test and see what happens.

One was down to about 5.5 Volts, while the other was down to around 7.5 Volts.

The test result surprised me. I didn't see them explode but one hour later this was the result.
The batteries were put outside during the test.
One pack completely ruptured, other one intact and holding some voltage.

It does certainly confirm the warnings about explosion danger of batteries.

Warning: if you do the test and decide to see what happens, I strongly recommend that you wear safety goggles and have a transparant piece of PVC or glass to shield yourself from the rupture.
You never know what way these cells may explode.

Regards, Raymond

ericgibbs · 1st May 2008, 10:04 AM

hi,
What was the test.?

RODALCO · 1st May 2008, 10:21 AM

Put + to - and + to - as per first photo.

The circulating current is limited by the batteries internal resistance.

The heating will rupture the casing.

audioguru · 2nd May 2008, 01:45 AM

At work a woman gave a speech to everybody. She had a wireless microphone that fed a PA system.
She began dancing and jumping.
The spare 9V alkaline battery in her pocket was shorted by her keys and was burning her.

Marks256 · 3rd May 2008, 02:36 AM

I used to do this as a kid thinking it would charge the other battery backup... Luckily this never happened to me!

Hero999 · 3rd May 2008, 10:27 PM

If you connected them positive to positive, then that would happen but not positive to negative.

Another thing is sometimes batteries can blow hours after they've been abused. When I was a child I remember connecting a 9V battery to a dead button cell to see what would happen. The button cell didn't rupture immediately but half an hour or so later.

bananasiong · 4th May 2008, 03:05 AM

When I was a kid, I've tried recharging the dead 9 V alkaline. Guess what, I connected the live and neutral to the +ve and -ve of the battery by using transparent tape

.
Then I turn on the main from far and turn off quickly. Smoke coming out

. Luckily there's no one else at home otherwise I got scolded

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1st May 2008, 10:04 AM	(permalink)
ericgibbs	hi, What was the test.? __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/

1st May 2008, 10:21 AM	(permalink)
RODALCO	Put + to - and + to - as per first photo. The circulating current is limited by the batteries internal resistance. The heating will rupture the casing. __________________ There are more ways to get to Rome. Electricity, Electric clocks, Meters and Trains are great.

2nd May 2008, 01:45 AM	(permalink)
audioguru	At work a woman gave a speech to everybody. She had a wireless microphone that fed a PA system. She began dancing and jumping. The spare 9V alkaline battery in her pocket was shorted by her keys and was burning her. __________________ Uncle $crooge

3rd May 2008, 02:36 AM	(permalink)
Marks256	I used to do this as a kid thinking it would charge the other battery backup... Luckily this never happened to me! __________________ There is no "I" in "team", unless Apple makes it... Then it would be iTeam.

3rd May 2008, 10:27 PM	(permalink)
Hero999	If you connected them positive to positive, then that would happen but not positive to negative. Another thing is sometimes batteries can blow hours after they've been abused. When I was a child I remember connecting a 9V battery to a dead button cell to see what would happen. The button cell didn't rupture immediately but half an hour or so later. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

4th May 2008, 03:05 AM	(permalink)
bananasiong	When I was a kid, I've tried recharging the dead 9 V alkaline. Guess what, I connected the live and neutral to the +ve and -ve of the battery by using transparent tape . Then I turn on the main from far and turn off quickly. Smoke coming out . Luckily there's no one else at home otherwise I got scolded __________________ Superman returns..