Question about Pentax Optio 555 Digital Camera

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555 battery life problem/question

My battery life is often around 140-170 pics (with substantial but not excessive time reviewing, downloading, etc.) This sounds much lower than the "worst case" results that others have experienced. As an experiment, I just snapped off a bunch in a row and got 410 shots (1/2 with flash) immediately after a fresh charge. But, in day-to-day usage (with the camera sitting on the shelf for days or maybe a week in between outings) the battery seems performs much worse. Maybe my battery is somehow self-discharging over time at an unusually high rate? Or maybe the charger doesn't always do a consistent job... I really don't know. Have any of you ever experienced such weak battery life (~150 shots)? If so, I will just buy an extra battery and "live with it". But, if everyone here is getting much better battery life, I'll get my camera/charger/battery serviced. Please respond so I can decide what to do.

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Re: 555 battery life problem/question

One way to find out If battery meets the specs. Take a fully charged battery and discharge it at 180Ma. As it is a 1800MaHr battery, it should deliver 180Ma for about 10Hrs.

Posted on Sep 08, 2005

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Re: 555 battery life problem/question

Let's see. I increase the RPM on my fan and it uses more power. I use a larger motor on the same size fan and it uses more power. Yes the startup time has decreased but that high power burst of startup is tough on batteries. Maybe it's a bad batch of batteries. I have seen that one user of the 555 has had good battery performance. I never saw any increase in the capability of my battery on my 450. 490 shots on first charge, plus 5 videos.

Posted on Sep 08, 2005

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Re: 555 battery life problem/question

Let's see. I increase the RPM on my fan and it uses more power. I use a larger motor on the same size fan and it uses more power. Yes the startup time has decreased but that high power burst of startup is tough on batteries. Maybe it's a bad batch of batteries. I have seen that one user of the 555 has had good battery performance. I never saw any increase in the capability of my battery on my 450. 490 shots on first charge, plus 5 videos.

Posted on Sep 08, 2005

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Re: 555 battery life problem/question

Do you think that motor speed would be such a big factor? I would have thought that unless the mass/resistance of the mechanism had changed significantly, the energy requirement to move the elements would be about the same, so power should not be the issue (more current; less time). Battery/motor efficiencies would have an effect, but it seems a bit much even for that compounding effect. I suspect something else must be going on. I have heard that for some batteries they do not achieve peak performance until several charge/discharge cycles. I hope that mine will improve over the next few months.

Posted on Sep 08, 2005

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Re: 555 battery life problem/question

Before you conclude that my camera and battery are also misbehaving, I would point out that I have had the camera turned on a lot as I fiddled with focus, zoom, menu settings, more focus and zoom, etc, etc. There there is simply LCD viewing time to look at pictures I have taken, playing with in-camera editing features, more viewing, zooming in and out during review mode, etc, etc. Then there is downloading a few pictures at a time, which probably carries with it some USB overhead each time I connect and disconnect. So, in my opinion, I have not given the camera a fair trial of battery performance yet. Some day, I hope to go out and shoot at least a 256k memory card full of pictures before I have to recharge. Or maybe a few card's worth of photos to get that 400-600 shots per charge.

Posted on Sep 08, 2005

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