# Voltage Vs. Current In A Laptop Battery?

#### Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

•  Subject
• Author
• Posted on
I noticed that this place

has two Dell D610 battries: one rated at a higher voltage-- 14.8 v
@2200mAH-- and another one at 11.1 V @ 4400 mAH. There's only a three
dollar differnce in price, but I have to wonder what's the best one to
buy in terms of performance? Higher voltage or higher current?

Ron

## Re: Voltage Vs. Current In A Laptop Battery?

On Wednesday, March 28, 2012 2:05:25 PM UTC-5, Ron wrote:

The one that is 11.1V is the original voltage for a D610. Batteries are usually
3, 6, or 9 cell depending on capacity (mAH). If you double or triple the cells
in parallel the voltage remains the same but the capacity increases.
Hope this makes sense.

## Re: Voltage Vs. Current In A Laptop Battery?

the cells in parallel the voltage remains the same but the capacity increa=
ses.

I' ve been in electronics for a *long* time and I got that, thanks;
but I still don't know which is a better battery to buy-- if there is
actually a "better battery,"  I've had this Dell laptop for over two
years and much is still a mystery as sooo many things need to be

Ron

## Re: Voltage Vs. Current In A Laptop Battery?

On Wednesday, March 28, 2012 9:18:00 PM UTC-5, Ron wrote:

le the cells in parallel the voltage remains the same but the capacity incr=
eases.

11.1 is the proper voltage...when I replaced my wife's Dell 6-cell (Inspiro=
n 1545) I went with the 9-cell. Same voltage.

## Re: Voltage Vs. Current In A Laptop Battery?

Hi Ron!

14.8v x 2.2AH = will deliver 32.56 watts in an hour
11.1v x 4.4AH = will deliver 48.84 watts in an hour

So you get about 50% more capacity in watts with the 11.1v one. And it
should run 50% longer than the other 14.8v one.

--
Bill
Gateway M465e ('06 era) - Windows Live Mail 2009
Centrino Core2 Duo T7400 2.16 GHz - 1.5GB - Windows 8 CP

## Re: Voltage Vs. Current In A Laptop Battery?

On Monday, April 2, 2012 3:41:33 PM UTC-5, BillW50 wrote:

Brilliant...go take a nap!

## Re: Voltage Vs. Current In A Laptop Battery?

On Mon, 2 Apr 2012 16:37:02 -0700 (PDT), Bob_Villa

Come on let it go !!!

## Re: Voltage Vs. Current In A Laptop Battery?

Okay, I got that, and many thanks. My concern was with the actual 14
volts-- would that be excessive voltage and possibly cause damage-- or
acceptable; the documentation for the D610 is pretty sketchy when it
comes to power specifications.

Ron

## Re: Voltage Vs. Current In A Laptop Battery?

In
Ron typed:

http://www.laptopbatterystore.com/category/dell-latitude-d610-batteri ...

Yes I too worried about that too. But I have a lot of Gateway batteries
at rated at 10.8v. Although I have one rated at 14.4v and I worried
about it. Although I have used it for years with no problems at all with
multiple laptops no less (some even different model numbers). Each cell
of a Lithium can vary 3.2v to 4.2v depending on the charge. So they are
a bit forgiving at the battery side anyway.

But in your case, the 14.8v one has less capacity. So grab the 11.1v one
with more capacity. And you don't have to worry about the extra voltage
anyway. ;-)

--
Bill
Asus EeePC 701 ~ 2GB RAM ~ 16GB-SDHC
Windows 2000 SP5 - OE6 - OE-QuoteFix v1.19.2

## Re: Voltage Vs. Current In A Laptop Battery?

I was always told that too many amps is OK but too many volts will
let the smoke out.  One time I connected the 12 volt lead to the 5 volt pad
and it sure enough did.  Another time I had a 20volt transformer and the end
fit the hub I was trying to plug in so I used it even though it said 16.5
volts DC and the smoke got out that time, too.  So I'd be scared to connect
a 14.4 volt input to something marked 11 volts DC.

## Re: Voltage Vs. Current In A Laptop Battery?

the wharf rat typed:

Yes I totally agree. As in the design, the engineers could choose how
far you could push it. Although in my example, both voltage batteries
are sold by the manufacture for the same model (and both are genuine
Gateway batteries). You figure they know what they are doing. ;-)

--
Bill
Asus EeePC 701 ~ 2GB RAM ~ 16GB-SDHC
Windows 2000 SP5 - OE6 - OE-QuoteFix v1.19.2

## Re: Voltage Vs. Current In A Laptop Battery?

Yeah, I was wondering that myself; why make a 14 volt battery that
actually would give you less working time than the 11 volt battery; it
semed to be an exercise in pointlessness-- but what the hell do I
know?  :-)

And speaking of futility, what's with the so-called "refresh" button?
Pressing it does exactly *what?*

Ron

## Re: Voltage Vs. Current In A Laptop Battery?

Watts in an hour? What a concept! So how many watts in two hours :-)

You really got that? Could you try explain it to me in simple words that
even an engineer might understand?

## Re: Voltage Vs. Current In A Laptop Battery?

These figures assume that the battery is completely discharged after an
hour which is not likely in normal use.

2.2AH means that if drained at 2.2 amps, it will be discharged in 1
hour.  Same for the other battery being drained at a 4.4 amp rate.

Multiplying those currents by the voltage (ignoring the drop in voltage
as complete discharge is approached) Gives the wattages shown.

--
Rich Greenberg  Sarasota, FL, USA richgr atsign panix.com  + 1 941 378 2097
Eastern time.  N6LRT  I speak for myself & my dogs only.    VM'er since CP-67
Canines: Val,Red,Shasta,Zero,Casey & Cinnar (At the bridge)   Owner:Chinook-L
Canines: Red & Max (Siberians)     Retired at the beach  Asst Owner:Sibernet-L

## Re: Voltage Vs. Current In A Laptop Battery?

Anthony R. Gold wrote:

Sorry I mean it will deliver x amount of watts for an hour. ;-)

It is pretty easy actually. Where it gets complicated is that lithium
batteries the internal resistance changes over time.

--
Bill
Gateway M465e ('06 era) - OE-QuoteFix v1.19.2
Centrino Core Duo T2400 1.83GHz - 2GB - Windows XP SP3

## Re: Voltage Vs. Current In A Laptop Battery?

Duh - I should have realised that for myself :-(

## Re: Voltage Vs. Current In A Laptop Battery?

Resistance is futile.

## Re: Voltage Vs. Current In A Laptop Battery?

On Sun, 8 Apr 2012 10:20:33 +0000 (UTC), wrat@panix.com (the wharf rat)
wrote:

;O)
--
Homeopathy kills
================
http://www.danbuzzard.net/journal/francine-scrayen-sends-me-a-cease-and-desist.html
http://steelclaws.wordpress.com/2012/04/05/who-was-penelope-dingle-and-why-what-happened-to-her-matters /

## Re: Voltage Vs. Current In A Laptop Battery?

Not at all weird - it's just that watts per hour is dimensionally fsk'd.

Please post here in English :-)

While true for DC, in the general case that will depend on the phase angle.

## Re: Voltage Vs. Current In A Laptop Battery?

On Sat, 07 Apr 2012 21:43:38 +0100, "Anthony R. Gold"

14.8 V * 2.2 Ah = 32.56 AVh

;O)

No. IIRC always true. That is how the unit was defined.
--
Homeopathy kills
================
http://www.danbuzzard.net/journal/francine-scrayen-sends-me-a-cease-and-desist.html
http://steelclaws.wordpress.com/2012/04/05/who-was-penelope-dingle-and-why-what-happened-to-her-matters /