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updated because of trickle charge

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2984 a1c6a512-1295-4272-9138-f99709370657
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Uwe Freese 2002-12-14 13:03:14 +00:00
parent 3817730f0f
commit eec501ee4d
1 changed files with 35 additions and 23 deletions
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58
docs/BATTERY-FAQ
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@ -11,14 +11,21 @@ A1: Player: the charging is all done by hardware and the exact
Q2: Will keeping my charger connected a long time damage my batteries? Can I
leave it over night?
A2: The charger logic lets the batteries charge until they are full. After
that, the charger is disabled, but the device will stay powered on and
continue to consume some power from the batteries (the hardware does
not allow running from the charger without charging batteries, or
powering off with the charger connected). After some time, it will
start charging the batteries again to keep them full. This will
wear the batteries a little, but overnight charging is what most
people do.
A2: There's a deep discharge mode and you can switch trickle charge on and off.
If you use your AJB connected to the power supply the whole time, select
"deep discharge on" and "trickle charge off". If you want to charge your
AJB over night and take it with you the next day, select "deep discharge
off" (that it starts charging immediately) and "trickle charge on"
(that the batteries remain full).
Trickle charge is needed to keep the batteries full. That's necessary because
the device will stay powered on and continue to consume some power from
the batteries (the hardware does not allow running from the charger
without charging batteries, or powering off with the charger connected).
The trickle charge time is 12 hours. It should be enough for you to disconnect
your AJB in this time and turn it off / use it.
However, after 12 hours of trickle charge, it will turn it off, the batteries
are discharged and another charge cycle is started.
As the Battery FAQ at http://www.greenbatteries.com/ puts it:
"A NiMH battery can be charged and discharged hundreds of times,
@ -30,18 +37,22 @@ Q3: Does Rockbox charge the batteries more/less/worse/better than the Archos
A3: Player: Rockbox doesn't affect the charging on Players, it is all done
by hardware logic out of software control.
Recorder: The current release of 1.2 is much worse than the Archos
charger, it tends to stop charging much too early and leave the batteries
half empty.
The current development code (CVS daily builds as of 20.8.2002) is much
better than the 1.2 release, but still not perfect. Linus recently
measured 6 hours continuous playtime after a rockbox charge, and much
over 7 hours after an Archos charge. We are working on fine-tuning
the charger logic to get the most out of the batteries, but the
emphasis is on not overcharging them, since that would damage the
batteries. Better be safe than sorry.
Recorder: The whole algorithm is made to carefully charge the batteries full
and keep them full after that with a trickle charge option. Many documents
about charge ICs were considered. If you want to know details, then look
into docs/CHARGING_ALGORITHM. If you have comments, write to
mail@uwe-freese.de or the Rockbox mailinglist.
Test results with trickle charge (battery capacities measured with an
external charger, Model "Conrad Electronic Charge Manager 2010", ~100 EUR):
- after normal charge and top off time: 1798, 1834, 1819, 1815 mAh
- after normal + top off + trickle charge (12h): 1784, 1748, 1738, 1752 mAh
- charged with external charger: 1786, 1819, 1802, 1802 mAh
You can see, whenever you take your AJB with you in the 12h trickle charge
period, the batteries are at least 97% full. :)
Q4: What kind of batteries are there in my factory default Player/Recorder?
A4: Both ship with 1500 mAh NiMH (Nickel Metal Hydride) batteries.
@ -63,13 +74,15 @@ A6: http://www.greenbatteries.com sells 1800 mAh NiMH cells at $3.25USD each,
online shops. Browse around. There's a pretty good comparison between
different battery makes and models at the digital imaging resource site:
http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM
In Germany, www.reichelt.de sells GP 2000 batteries for 2,75 EUR (12/2002).
Q7: What kind of run-time can I expect on a set of fully-charged batteries
when running Rockbox?
A7: For the stock 1500 mAh cells, from 6 hours to 8 hours, depending on
which charger was used (see Q3). It depends a lot on the condition of
the batteries. We are looking into implementing more battery-saving
techniques in rockbox to make it rock longer.
which charger was used (see Q3). It depends a lot on the condition of the
batteries. With 2000 mAh batteries, you should reach about 10 hours or more.
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? How much playtime would
I gain by using 1800 mAh batteries instead of the 1500 mAh ones?
@ -205,4 +218,3 @@ A15: That depends on who you ask. ;-) NiMH sellers say NiMHs are better and
However, if you use your AJB connected to the charger all the time,
we recommend you to use the deep discharge option.