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Subject: Re: How do you calculate the battery status?
From: TP Diffenbach (
Date: 2003-08-13

Quoting Nanker Phelg <>:

> I have the same behavior on my new JBR 15. I wrote this mailing list about it a
> week ago, but I never got a response.
> Does anyone have any information on the battery charging/capacity status on the
> JBR 15?
> Thanks
> ---- Begin Original Message ----
> Hi,
> I have a JBR 15. I installed the RockBox(nightly build) and I am very happy
> with it. There is one problem however - the battery status is totally wrong.
> Around half charge i switch off. Then, when i boot it tells me i have 9%
> left. ok. after 10 minutes it says 25% and continues to climb. The first
> time i saw this it climbed to 50% and just then started falling again.
> Voltage stays virtually the same during the climbing(roughly 5.05v according
> to the I/O ports). So now its impossible for me to tell when to plug the
> charger.
> What gives? Is it time for new batteries yet(right now I am using the
> default 1500mAh and they are about a year old)?

This is normal behavior. the battery calculation is based on a moving average, and
is incorrect immediately after booting.


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Page was last modified "Jan 10 2012" The Rockbox Crew