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Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
Has anyone ever heard of the internal resistance of each battery becoming significant in a string like this? It seems that there might be a problem with that last battery in the chain being connected to Vtot - 9V. Wouldn't this be too much power to expect one battery to handle? Current limiting might be the answer.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Most 9v batteries (that i have opened) are made of 6 individual cells of 1.5v each and the most voltage any 1 battery will see is 9v so insulation wont be a problem (internaly)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yeah, none of batteries will see more than it's own voltage. Problem with seriesed transformers is existence of primary, in proximity to core, wich high voltage can arc to.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
What I was trying to say is most 9V batteries have a metal can housing, and it's usually floating/insulated from both terminals, and that insulation might see higher voltage depending on the construction of the bank.
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What to do with 100 9V batteries?
