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Based on comments from Uwe Freese, added answers for memory effect and

Browse source 
playtime gain for higher-rating batteries. Tuned the different charger
answer a little.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2048 a1c6a512-1295-4272-9138-f99709370657
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Heikki Hannikainen 2002-08-29 06:34:03 +00:00
parent 7189bf2ad7
commit 1198d37ee9
1 changed files with 38 additions and 9 deletions
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47
docs/BATTERY-FAQ
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@ -70,11 +70,22 @@ A7: For the stock 1500 mAh cells, from 6 hours to 8 hours, depending on
the batteries. We are looking into implementing more battery-saving
techniques in rockbox to make it rock longer.
Q8: Can I use different batteries in my Archos?
Q8: Can I use different batteries in my Archos? How much playtime would
I gain by using 1800 mAh batteries instead of the 1500 mAh ones?
A8: Only use NiMH-type rechargeable batteries. It is considered to be safe
to use NiMH batteries of different capacities though, a lot of people
have purchaced 1700 or 1800 mAh batteries to replace the stock 1500 mAh
cells and have the device run a bit longer.
cells and have the device run a bit longer. 2000 mAh batteries are
just appearing in shops are equally good to use.
In theory, running time = capacity of batteries / current drawn by device,
so running time should increase linearly by the capacity, and 2000 mAh
over 1500 mAh should give 33% longer running time. In practice, the
mAh ratings are more or less tuned up by the marketing department
(think of watts on the back of "hi-fi" speakers and amplifiers) and
what you actually get out of the cells is something else than what is
printed on them. Check the excellent imaging-resource link above for
details!
Q9: Can I use non-chargeable batteries in my Archos?
A9: This is not recommended. The unit has been designed to operate with
@ -86,23 +97,32 @@ A9: This is not recommended. The unit has been designed to operate with
and the unit.
Q10: Can I use a different charger?
A10: People have successfully used different chargers with similar
specifications as the stock charger. The charger must have the
same kind of connector with same polarity (center positive/+).
A10: The short answer is: Using a different charger will void your warranty
and can be dangerous to your unit, so we can not recommend it.
On the other hand, people have successfully used different chargers
with similar specifications as the stock charger. The charger must
have the same kind of connector with same polarity (center positive/+).
The charger should supply at least 7-8 volts, and if it provides
more than 9V, it probably should be current limited (do not
more than 10V, it probably should be regulated to 9V (do not
directly plug it in your 12V car battery or it's charger!).
The universal travel charger sold by Archos is specified at
12V, 1.2A so that's probably the maximum rating you should use.
A good circuit for powering from a car battery or other source
with a higher voltage would be a 600 mA fuse and a 9V regulator like
a 7809 of your favourite manufacturer in series.
Using lower charging voltage will slow down the charging, and using
higher voltage will cause a higher charging current, more heat,
and too much heat and current can damage the batteries or the unit.
Using a different charger will void your warranty and can be
dangerous to your unit, so we can not recommend it.
Inside the Jukebox there is a regulator which limits the charging
voltage applied to the batteries (which in turn limits the current
- the usual ohm's law applies: current = voltage / resistance) but
if a high input voltage is applied, the regulator will heat up a lot!
Many people are happy using an external quick charger which
is specified to work with NiMH batteries.
is specified to work with NiMH batteries. This is completely safe
and will not void your warranty.
Q11: Can I buy a replacement charger exactly as the one Archos shipped?
A11: The FAQ on the Archos web site and the top of the charger both read:
@ -152,3 +172,12 @@ A14: When Rockbox is running on the Recorder (the device has been booted
If the battery is not full, it will start charging. If the 'deep
discharge' mode is enabled in the settings menu, it will start charging
only when the battery is almost empty.
Q15: What about the memory effect? Should I be worried about it or not?
A15: That depends on who you ask. ;-) NiMH sellers say NiMHs are better and
do not have a memory effect, but the usual opinion seems to be that
they do, although it is very small.
However, if you use your AJB connected to the charger all the time,
we recommend you to use the deep discharge option.