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#49943 - 03/21/05 05:27 AM Battery Connection Basics
Frank Cinker Offline
Member

Registered: 07/29/01
Posts: 317
Loc: 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 07:21 AM Re: Battery Connection Basics
gfretwell Offline


Member

Registered: 07/20/04
Posts: 9066
Loc: 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
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Greg Fretwell

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#49945 - 03/22/05 03:02 AM Re: Battery Connection Basics
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: 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

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#49946 - 03/22/05 01:10 PM Re: Battery Connection Basics
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2342
Loc: 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).]
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#49947 - 03/25/05 01:02 PM Re: Battery Connection Basics
DougW Offline
Member

Registered: 06/08/03
Posts: 1083
Loc: 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...

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#49948 - 03/25/05 01:23 PM Re: Battery Connection Basics
SolarPowered Offline
Member

Registered: 07/05/04
Posts: 615
Loc: 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?

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#49949 - 03/25/05 01:33 PM Re: Battery Connection Basics
winnie Offline
Member

Registered: 09/15/03
Posts: 652
Loc: 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

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#49950 - 03/25/05 02:27 PM Re: Battery Connection Basics
highvoltageguy Offline
Member

Registered: 03/03/05
Posts: 56
Loc: 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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