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#49943 - 03/21/05 09:27 AM Battery Connection Basics  
Frank Cinker  Offline
Member
Joined: Jul 2001
Posts: 311
Pennsylvania
Two 6 volt, 10 Amp Hour batteries connected in series = 12 volts, 20 amp hours.

Two 6 volt, 10 Amp Hour batteries connected in parallel = 6 volts, 20 amp hours.

Am I correct? It's early in the morning and I'm drawing a blank concerning total amp hours of batteries in series or parallel.


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#49944 - 03/21/05 11:21 AM Re: Battery Connection Basics  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
Connected is series you have the same amp hours at twice the voltage
Connected in parallel you double the amp hours at the same voltage


Greg Fretwell

#49945 - 03/22/05 07:02 AM Re: Battery Connection Basics  
Steve Miller  Offline
Member
Joined: Aug 2001
Posts: 325
Loudoun Cty, VA
Just like gfretwell says

"Connected is series you have the same amp hours at twice the voltage
Connected in parallel you double the amp hours at the same voltage"

"Two 6 volt, 10 Amp Hour batteries connected in series = 12 volts, 20 amp hours" ... nope ... 12v 10A

"Two 6 volt, 10 Amp Hour batteries connected in parallel = 6 volts, 20 amp hours" ... uh huh


#49946 - 03/22/05 05:10 PM Re: Battery Connection Basics  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,232
West Virginia
Yup,

For instance: the 19.2v 3.5Ah Nickel-Metal-Hydride packs for the panasonic drills are really 16 1.2v 3.5Ah sub-C cells inside the case. You can buy Panasonic sub-C Nickel-Metal-Hydrides individually (or by the case).They'll retro-fit in any DeWalt, Milwaukee, Makita, etc. cases with a soldering iron, a torx (or other) screwdriver and some time.

Increase your DeWalt to twice the runtime!

</old R/C fanatic>

[This message has been edited by sparky66wv (edited 03-22-2005).]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#49947 - 03/25/05 05:02 PM Re: Battery Connection Basics  
DougW  Offline
Member
Joined: Jun 2003
Posts: 1,143
North Chicago, IL
D'ya think allied would have those, or do you have another source?

My DeWalt batts are fine now, but that info's nice to have...


#49948 - 03/25/05 05:23 PM Re: Battery Connection Basics  
SolarPowered  Offline
Member
Joined: Jul 2004
Posts: 625
Palo Alto, CA, USA
A while ago I priced the Panasonic NiMH cells from DigiKey, and the price for ten was essentially the same as a new 12V battery pack for my drill. Anyone have a better source for cells?


#49949 - 03/25/05 05:33 PM Re: Battery Connection Basics  
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
Check out http://www.batterystation.com/nicads.htm

I've dealt with batterystation in the past and like their service.

One word of caution: cells are rated by voltage, ampacity, and _internal resistance_ among other characteristics. In general, higher amp-hour cells also have higher internal resistance, meaning greater voltage drop under load. You want to be careful about substituting NiMH cells for NiCd cells, because if you select cells with high internal resistance, then in a high load application you will actually get _less_ useable output from the cells.

-Jon


#49950 - 03/25/05 06:27 PM Re: Battery Connection Basics  
highvoltageguy  Offline
Member
Joined: Mar 2005
Posts: 53
Silt, Colorado, USA
I just bought a so every one was saying a obsolete cell phone batt. from this outfit, and compared the dewalt batts. looked like a good price. http://www.dsmiller.com/



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