I would like to build a portable power supply for a 11" digital
picture frame. The 9volt supply would need to last 6 hours, Would I
be better off with 9 volt batteries tied together or use 1.5 volt
batteries tied together?

<osbo47@hotmail.com> wrote in message
news:4484fe4c-f8c3-4354-86f4-75f8c9561449@d5g2000hsc.googlegroups.com...
> I would like to build a portable power supply for a 11" digital
> picture frame. The 9volt supply would need to last 6 hours, Would I
> be better off with 9 volt batteries tied together or use 1.5 volt
> batteries tied together?

You will need to measure the current that the picture frame draws
from the 9 volt battery before an estimate can be made.

On Mon, 25 Feb 2008 20:45:40 -0800, osbo47 wrote:

> I would like to build a portable power supply for a 11" digital picture
> frame. The 9volt supply would need to last 6 hours, Would I be better
> off with 9 volt batteries tied together or use 1.5 volt batteries tied
> together?

I'd go with 6 cells. How big will depend on how much current you need.
You might also use three 3-volt rechargeable lithum cells; the one in my
cellphone is rated at 1 amp-hour, which would be massive overkill for
your application.

<osbo47@hotmail.com> wrote in message
news:4484fe4c-f8c3-4354-86f4-75f8c9561449@d5g2000hsc.googlegroups.com...
> I would like to build a portable power supply for a 11" digital
> picture frame. The 9volt supply would need to last 6 hours, Would I
> be better off with 9 volt batteries tied together or use 1.5 volt
> batteries tied together?


Not likely. Here are the specs for a battery pack from Aluratek, Inc for an
11" frame:

quote === quote === quote ===
Up to 2 hours of run time
Compatible with 9V and 12V digital photo frames
Easily mounts to the back of the frame
5 interchangeable tips to ensure a correct match to your frame
Power your digital frame anywhere, anytime
Included AC adapter for easy charging
Rated capacity 16.6 WH
Limited 1 year warranty
quote === quote === quote ===

I'm guessing they meant 16.6AH. So, your 9V battery would last about 30
seconds...

The link for the battery pack is here, in case you want to buy one:

http://www.aluratek.com/product_info.ph ... isplay=All

Regards,
Bob Monsen

Bob Monsen wrote:

> quote === quote === quote ===
> Up to 2 hours of run time
> Compatible with 9V and 12V digital photo frames
> Easily mounts to the back of the frame
> 5 interchangeable tips to ensure a correct match to your frame
> Power your digital frame anywhere, anytime
> Included AC adapter for easy charging
> Rated capacity 16.6 WH
> Limited 1 year warranty
> quote === quote === quote ===
>
> I'm guessing they meant 16.6AH. So, your 9V battery would last about 30
> seconds...
>
> The link for the battery pack is here, in case you want to buy one:
>
> http://www.aluratek.com/product_info.ph ... isplay=All
>


Did you look at the size of that battery pack? It is way to small to
be 16.6AH at 12 or even 9 volts. If it is as they say 16.6WH, at 12V
that would be 1383mAh which seems about right for the size of the pack
and it would have to use lithium batteries to have that capacity and be
that small. So if the OP's photo frame would last 2 hours on this pack,
it should last almost 4 hours on a single set of 2700mah rechargeable AA
NiMH cells that are commonly available. If changing the battery part way
through his 6 hours is acceptable then he can just make 2 packs, if not
build 2 packs and hook them together in parallel.


--
Chris W
KE5GIX

"Protect your digital freedom and privacy, eliminate DRM,
learn more at http://www.defectivebydesign.org/what_is_drm"

Ham Radio Repeater Database.
http://hrrdb.com

Chris W wrote:
> Bob Monsen wrote:
>
>> quote === quote === quote ===
>> Up to 2 hours of run time
>> Compatible with 9V and 12V digital photo frames
>> Easily mounts to the back of the frame
>> 5 interchangeable tips to ensure a correct match to your frame
>> Power your digital frame anywhere, anytime
>> Included AC adapter for easy charging
>> Rated capacity 16.6 WH
>> Limited 1 year warranty
>> quote === quote === quote ===
>>
>> I'm guessing they meant 16.6AH. So, your 9V battery would last about
>> 30 seconds...
>>
>> The link for the battery pack is here, in case you want to buy one:
>>
>> http://www.aluratek.com/product_info.ph ... isplay=All
>>
>
>
> Did you look at the size of that battery pack? It is way to small to
> be 16.6AH at 12 or even 9 volts. If it is as they say 16.6WH, at 12V
> that would be 1383mAh which seems about right for the size of the pack
> and it would have to use lithium batteries to have that capacity and be
> that small. So if the OP's photo frame would last 2 hours on this pack,
> it should last almost 4 hours on a single set of 2700mah rechargeable AA
> NiMH cells that are commonly available. If changing the battery part way
> through his 6 hours is acceptable then he can just make 2 packs, if not
> build 2 packs and hook them together in parallel.
>
>
Ditto,I have a 17AH SLA,and it's bigger than the whole damn frame,prolly
weighs about 50x as much also.
Get some decent Nicd/Nimh cells,and a charger.