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authorDaniel Stenberg <daniel@haxx.se>2003-06-03 08:43:53 +0000
committerDaniel Stenberg <daniel@haxx.se>2003-06-03 08:43:53 +0000
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Q1: Are my batteries charged all the time when connected to my Player/Recorder?
-A1: Player: the charging is all done by hardware and the exact
- functionality is hard to determine. It is however not recommended to keep
- the charger connected for more than 10-15 hours if you're not using the
- unit.
+A1: Player: the charging is all done by hardware and the exact functionality
+ is hard to determine. It is however not recommended to keep the charger
+ connected for more than 10-15 hours if you're not using the unit.
Recorder: no. The charging algorithm is carefully crafted in to not wear
out the batteries any more than necessary. If you're using your unit
@@ -11,60 +10,62 @@ 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: 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
+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.
+ 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,
- but whether that means 200 times or 800 times has a lot to do
- with how (you use it)".
+
+ "A NiMH battery can be charged and discharged hundreds of times, but
+ whether that means 200 times or 800 times has a lot to do with how (you
+ use it)".
Q3: Does Rockbox charge the batteries more/less/worse/better than the Archos
firmware?
A3: Player: Rockbox doesn't affect the charging on Players, it is all done
by hardware logic out of software control.
- 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
+ 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):
+ 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. :)
+ 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.
Q5: Is it hard to change the batteries? Does it void my warranty?
A5: It is not very hard - the Archos manual and the FAQ on their web site
- describe how to do it. Their technical support confirmed that
- replacing the batteries with NiMH cells (of different capacities)
- will not void the warranty. Just don't remove the screws.
+ describe how to do it. Their technical support confirmed that replacing
+ the batteries with NiMH cells (of different capacities) will not void the
+ warranty. Just don't remove the screws.
Some units have been shipped with two sets of batteries, my Recorder 20
- only had one set. Someone actually had Archos send him new batteries
- free of charge after they had weared out, under the warranty.
+ only had one set. Someone actually had Archos send him new batteries free
+ of charge after they had weared out, under the warranty.
Q6: How much do replacement batteries cost? Where can I buy them?
A6: http://www.greenbatteries.com sells 1800 mAh NiMH cells at $3.25USD each,
@@ -73,67 +74,63 @@ A6: http://www.greenbatteries.com sells 1800 mAh NiMH cells at $3.25USD each,
sold in almost all shops that sell consumer electronics, and in many
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).
+ 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) and the bitrate you use (higher bitrate
- means more harddisk runtime). 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.
- If you have a modified AJB with 8 MB, you can reach playing times of up to
- 16 hours with 2100 mAh batteries.
+A7: For the stock 1500 mAh cells, from 6 hours to 8 hours, depending on which
+ charger was used (see Q3) and the bitrate you use (higher bitrate means
+ more harddisk runtime). 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. If you have a modified AJB with 8 MB, you
+ can reach playing times of up to 16 hours with 2100 mAh batteries.
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. 2000 mAh batteries are
- just appearing in shops are equally good to use.
+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. 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!
+ 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
- four 1.2V batteries producing about 4.8V at most, and using 1.5V
- alkaline/zinc carbon batteries will produce around 6.0V, which will
- heat up the unit a lot more and might even damage it. The Archos
- manual explicitly tells you not to do so.
- Also, if you connect the charger, it may even destroy both the batteries
- and the unit.
+A9: This is not recommended. The unit has been designed to operate with four
+ 1.2V batteries producing about 4.8V at most, and using 1.5V alkaline/zinc
+ carbon batteries will produce around 6.0V, which will heat up the unit a
+ lot more and might even damage it. The Archos manual explicitly tells you
+ not to do so. Also, if you connect the charger, it may even destroy both
+ the batteries and the unit.
Q10: Can I use a different charger?
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 10V, it probably should be regulated to 10V (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 10V regulator like
- a 7810 of your favourite manufacturer in series.
+ 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
+ 10V, it probably should be regulated to 10V (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 10V
+ regulator like a 7810 of your favourite manufacturer in series.
- Inside the Jukebox there is a regulator which limits the charging
- current applied to the batteries. The higher the input voltage, the hotter
- this IC gets. Don't use an input voltage above 12V.
- Using lower charging voltage < 10V will slow down the charging. But the
- rockbox charging algorithm should work then, too.
+ Inside the Jukebox there is a regulator which limits the charging current
+ applied to the batteries. The higher the input voltage, the hotter this
+ IC gets. Don't use an input voltage above 12V. Using lower charging
+ voltage < 10V will slow down the charging. But the rockbox charging
+ algorithm should work then, too.
These are the output voltages of an original archos power supply:
- connected to AJB Recorder, not charging: 13,7 Volt
@@ -162,9 +159,9 @@ A10: The short answer is: Using a different charger will void your warranty
- use a fuse of ~600mA
- using a different charger voids your warrenty
- Many people are happy using an external quick charger which
- is specified to work with NiMH batteries. This is completely safe
- and will not void your warranty.
+ Many people are happy using an external quick charger which 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:
@@ -172,15 +169,15 @@ A11: The FAQ on the Archos web site and the top of the charger both read:
Output: 9VDC 600mA
Center positive (+) polarity
- The universal travel charger sold separately on the Archos web site
- is specified for 12VDC, 1200mA output.
+ The universal travel charger sold separately on the Archos web site is
+ specified for 12VDC, 1200mA output.
- Chargers with similar (or user-adjustable) properties are available
- at shops selling consumer electronics.
+ Chargers with similar (or user-adjustable) properties are available at
+ shops selling consumer electronics.
Q12: I often need to stop my player for about 15 minutes or so, and when I do
it runs off it's batteries. I was wondering, which is best: shutting the
- player down completely and rebooting it when I want to listen again, or
+ player down completely and rebooting it when I want to listen again, or
leaving the unit on? Which way does it draw more power?
A12: In our testing we found the following results:
HDD off, backlight off, idle 94 mA
@@ -215,13 +212,13 @@ A12: In our testing we found the following results:
Q13: When I plug in the charger when the Recorder is turned off, it turns
itself on and starts charging in the Archos software? What's up?
A13: There is a switch in the DC IN jack of the Jukebox - when a charger (or
- whatever) is plugged in, the unit is powered on, even if the charger
- is not plugged in a mains outlet.
+ whatever) is plugged in, the unit is powered on, even if the charger is
+ not plugged in a mains outlet.
If the charger is providing power at this point, the Archos firmware
located on the FLASH ROM does not load a new firmware version (like
- Rockbox) from the disk, but goes into charging mode instead. You can
- use this feature to get to the Archos charger if you want to.
+ Rockbox) from the disk, but goes into charging mode instead. You can use
+ this feature to get to the Archos charger if you want to.
Q14: When I plug the charger in my Recorder, it doesn't immediately start
charging the batteries!
@@ -233,29 +230,29 @@ A14: When Rockbox is running on the Recorder (the device has been booted
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.
+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.
-Q16: When I start my Jukebox, (dis)connect the charger and browse through the
- directories, the battery level changes a little bit. Sometimes it's even
+Q16: When I start my Jukebox, (dis)connect the charger and browse through the
+ directories, the battery level changes a little bit. Sometimes it's even
going up without the charger is connected! What's wrong?
-A16: Nothing's wrong. The battery level is calculated out of the voltage.
- Because disk spinning, LED backlight, charger all influence the actual
- battery voltage, it is usual that the battery level is going a little bit
- up and down sometimes. This cannot be avoided although we tried to make the
- battery level display as little confusing as we could.
+A16: Nothing's wrong. The battery level is calculated out of the voltage.
+ Because disk spinning, LED backlight, charger all influence the actual
+ battery voltage, it is usual that the battery level is going a little bit
+ up and down sometimes. This cannot be avoided although we tried to make
+ the battery level display as little confusing as we could.
Q17: My batteries are at 92%, the charger is connected to my recorder, deep
discharge is off. But charging doesn't start. What's wrong?
A17: Charging starts if the battery level is below 85%. This is because
charging batteries that *are* already more or less full is not good for
the batteries and the end of the charging cycle can't be detected safely.
- So it's better to start at a level at least as low as 85%.
- If you want to have full batteries in the morning, leave the charger
- connected over night. Charging will then start some hours later. The
- second possibility: Use the Archos charging algorithm. At least,
- your batteries will be full one more time. ;-) \ No newline at end of file
+ So it's better to start at a level at least as low as 85%. If you want
+ to have full batteries in the morning, leave the charger connected over
+ night. Charging will then start some hours later. The second possibility:
+ Use the Archos charging algorithm. At least, your batteries will be full
+ one more time. ;-)