Subject:
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Re: Battery life
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 16 Apr 1997 18:35:50 GMT
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Original-From:
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rabbit <g-webb@ux1.+AntiSpam+cso.uiuc.edu>
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Viewed:
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3948 times
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Ive got a pretty crappy answer for you but its the best I can offer;
check out how much current the RAM draws from a data sheet and calculate
the power it uses (P = IV, where I=RAM current, and V=5v). Divide the
mWHr your battery delivers by the power you found and that will give you
the number of hours that a fully charged battery should power your
handyboard RAM (assuming you could run the battery all the way to
empty). mWhr is in units of (Power/second)*Hours, so you will actually
be getting time in terms of Hours/second, so you will have to divide the
time you get by 3600 since there are that many seconds in an hour.
I myself have left the handyboard off for periods of 4weeks or
more and still have had my memory. I just rattled the above off the top
of my head so, anyone, please correct any glaring errors.
On Wed, 16 Apr 1997, Oriol de los Santos Vidal wrote:
> I think I already posted this question some time ago but never got an answer.
>
> Is it normal to have the HB run out of battery even when is not being used ?? I know the battery is always working to keep the RAM from erasing, but I'm wondering how long before the battery must be recharged if the HB is turned off.
>
> Thanks
> Oriol
>
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Message has 1 Reply:
 | | Re: Battery life
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| rabbit> 3600 since there are that many seconds in an hour. I myself rabbit> have left the handyboard off for periods of 4weeks or more rabbit> and still have had my memory. I just rattled the above off rabbit> the top of my head so, anyone, please (...) (30 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Battery life
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| I think I already posted this question some time ago but never got an answer. Is it normal to have the HB run out of battery even when is not being used ?? I know the battery is always working to keep the RAM from erasing, but I'm wondering how long (...) (30 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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