battery power supply

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?

 

[Lord Garth]

<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.

 

[Stephen J. Rush]

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.

 

[Bob Monsen]

<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.php?products_id=49&display=All

Regards,
Bob Monsen

 

[Chris W]

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.php?products_id=49&display=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

 

[PhattyMo]

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.php?products_id=49&display=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.