I'm not sure if you want to put a 9V battery
directly to a BP511, I hope not, You need some sort of charging
circuit.
Doing some checking, I think you'd have to carry a lot of the 9V
batteries. The typical 9V battery has a capacity of 500mAh while a
BP511 has capacities from 1350-1500mAh. As the battery becomes
depleted the voltage drops. As the voltage drops recharging sort of
stops when the input voltage comes closer to the battery being
charged. So you'd have to parallel three or four 9V to get charging
capacity for the lithium ion BP511.
One exception was the Mercury cells that were a constant 1.35V from
start to finish, a characteristic that made them ideal for metering in
the old film cameras like my OM-1.
This has been an interesting thread.
Bob
mark@xxxxxxxxxxxxxxxxxxxx wrote:
Well
there are some good ideas. I always carry 3 batteries, but one never
knows just how fast one is going to go through them and when one is
going to decide to up and quit. Staying out for as much as a week
needing 3 batteries per day would be tough.
I don't know if the simple light weight 9 volt battery, the type that
used to be used in radios before Ipods would work. Light, may not last
that long, but a 9 volt is a couple of bucks. Best Buy had the
batteries for about $40 bucks or so. Yes I can get them cheaper, but I
am not going to get them $2 cheap and if that $2 will charge a $40 buck
battery all the better.
The back packs with the solar cells look interesting and could be a
solution for a laptop battery, but its also a lot more than I wanted to
spend at this point. I bought two 4 gig CF flash cards at Costco last
week for about 35 bucks. Extra cards for me would make more sense than
trying to deal with an image dump till I can get to power for the
laptop.
I did see what looked like a grip for the body on KEH that took AA
batteries. The AA might solve the problem if a set of batteries would
last as long as a battery pack. Again that was also a couple of
hundred bucks, but I would at least get the verticle shutter release
back.
-------- Original Message --------
Subject: Re: Recharging digital camera batteries
From: Bob <w8imo@xxxxxxxx>
Date: Wed, April 15, 2009 9:20 pm
To: List for Photo/Imaging Educators - Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxx>
I'm curious, what voltage batteries do they
charge and how small do they fold?
Bob
Emily L. Ferguson wrote:
Rolled plastic solar chargers have been used on boats now
for about 10 years. They're all over the web, just hunt them down.
--
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( O O )
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I plan to live forever. So far, so good......
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( O O )
--------------------oOOO-----O----OOOo-----73 de w8imo@xxxxxxxx------
I plan to live forever. So far, so good......
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