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1Q1: Are my batteries charged all the time when connected to my Player/Recorder? 1Q1: Are my batteries charged all the time when connected to my Player/Recorder?
2A1: Player: the charging is all done by hardware and the exact 2A1: Player: the charging is all done by hardware and the exact functionality
3 functionality is hard to determine. It is however not recommended to keep 3 is hard to determine. It is however not recommended to keep the charger
4 the charger connected for more than 10-15 hours if you're not using the 4 connected for more than 10-15 hours if you're not using the unit.
5 unit.
6 5
7 Recorder: no. The charging algorithm is carefully crafted in to not wear 6 Recorder: no. The charging algorithm is carefully crafted in to not wear
8 out the batteries any more than necessary. If you're using your unit 7 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
11 10
12Q2: Will keeping my charger connected a long time damage my batteries? Can I 11Q2: Will keeping my charger connected a long time damage my batteries? Can I
13 leave it over night? 12 leave it over night?
14A2: There's a deep discharge mode and you can switch trickle charge on and off. 13A2: There's a deep discharge mode and you can switch trickle charge on and
15 If you use your AJB connected to the power supply the whole time, select 14 off. If you use your AJB connected to the power supply the whole time,
16 "deep discharge on" and "trickle charge off". If you want to charge your 15 select "deep discharge on" and "trickle charge off". If you want to charge
17 AJB over night and take it with you the next day, select "deep discharge 16 your AJB over night and take it with you the next day, select "deep
18 off" (that it starts charging immediately) and "trickle charge on" 17 discharge off" (that it starts charging immediately) and "trickle charge
19 (that the batteries remain full). 18 on" (that the batteries remain full).
20 19
21 Trickle charge is needed to keep the batteries full. That's necessary because 20 Trickle charge is needed to keep the batteries full. That's necessary
22 the device will stay powered on and continue to consume some power from 21 because the device will stay powered on and continue to consume some power
23 the batteries (the hardware does not allow running from the charger 22 from the batteries (the hardware does not allow running from the charger
24 without charging batteries, or powering off with the charger connected). 23 without charging batteries, or powering off with the charger connected).
25 The trickle charge time is 12 hours. It should be enough for you to disconnect 24 The trickle charge time is 12 hours. It should be enough for you to
26 your AJB in this time and turn it off / use it. 25 disconnect your AJB in this time and turn it off / use it. However, after
27 However, after 12 hours of trickle charge, it will turn it off, the batteries 26 12 hours of trickle charge, it will turn it off, the batteries are
28 are discharged and another charge cycle is started. 27 discharged and another charge cycle is started.
29 28
30 As the Battery FAQ at http://www.greenbatteries.com/ puts it: 29 As the Battery FAQ at http://www.greenbatteries.com/ puts it:
31 "A NiMH battery can be charged and discharged hundreds of times, 30
32 but whether that means 200 times or 800 times has a lot to do 31 "A NiMH battery can be charged and discharged hundreds of times, but
33 with how (you use it)". 32 whether that means 200 times or 800 times has a lot to do with how (you
33 use it)".
34 34
35Q3: Does Rockbox charge the batteries more/less/worse/better than the Archos 35Q3: Does Rockbox charge the batteries more/less/worse/better than the Archos
36 firmware? 36 firmware?
37A3: Player: Rockbox doesn't affect the charging on Players, it is all done 37A3: Player: Rockbox doesn't affect the charging on Players, it is all done
38 by hardware logic out of software control. 38 by hardware logic out of software control.
39 39
40 Recorder: The whole algorithm is made to carefully charge the batteries full 40 Recorder: The whole algorithm is made to carefully charge the batteries
41 and keep them full after that with a trickle charge option. Many documents 41 full and keep them full after that with a trickle charge option. Many
42 about charge ICs were considered. If you want to know details, then look 42 documents about charge ICs were considered. If you want to know details,
43 into docs/CHARGING_ALGORITHM. If you have comments, write to 43 then look into docs/CHARGING_ALGORITHM. If you have comments, write to
44 mail@uwe-freese.de or the Rockbox mailinglist. 44 mail@uwe-freese.de or the Rockbox mailinglist.
45 45
46 Test results with trickle charge (battery capacities measured with an 46 Test results with trickle charge (battery capacities measured with an
47 external charger, Model "Conrad Electronic Charge Manager 2010", ~100 EUR): 47 external charger, Model "Conrad Electronic Charge Manager 2010", ~100
48 EUR):
48 49
49 - after normal charge and top off time: 1798, 1834, 1819, 1815 mAh 50 - after normal charge and top off time: 1798, 1834, 1819, 1815 mAh
50 - after normal + top off + trickle charge (12h): 1784, 1748, 1738, 1752 mAh 51 - after normal + top off + trickle charge (12h): 1784, 1748, 1738, 1752 mAh
51 - charged with external charger: 1786, 1819, 1802, 1802 mAh 52 - charged with external charger: 1786, 1819, 1802, 1802 mAh
52 53
53 You can see, whenever you take your AJB with you in the 12h trickle charge 54 You can see, whenever you take your AJB with you in the 12h trickle charge
54 period, the batteries are at least 97% full. :) 55 period, the batteries are at least 97% full. :)
55 56
56Q4: What kind of batteries are there in my factory default Player/Recorder? 57Q4: What kind of batteries are there in my factory default Player/Recorder?
57A4: Both ship with 1500 mAh NiMH (Nickel Metal Hydride) batteries. 58A4: Both ship with 1500 mAh NiMH (Nickel Metal Hydride) batteries.
58 59
59Q5: Is it hard to change the batteries? Does it void my warranty? 60Q5: Is it hard to change the batteries? Does it void my warranty?
60A5: It is not very hard - the Archos manual and the FAQ on their web site 61A5: It is not very hard - the Archos manual and the FAQ on their web site
61 describe how to do it. Their technical support confirmed that 62 describe how to do it. Their technical support confirmed that replacing
62 replacing the batteries with NiMH cells (of different capacities) 63 the batteries with NiMH cells (of different capacities) will not void the
63 will not void the warranty. Just don't remove the screws. 64 warranty. Just don't remove the screws.
64 65
65 Some units have been shipped with two sets of batteries, my Recorder 20 66 Some units have been shipped with two sets of batteries, my Recorder 20
66 only had one set. Someone actually had Archos send him new batteries 67 only had one set. Someone actually had Archos send him new batteries free
67 free of charge after they had weared out, under the warranty. 68 of charge after they had weared out, under the warranty.
68 69
69Q6: How much do replacement batteries cost? Where can I buy them? 70Q6: How much do replacement batteries cost? Where can I buy them?
70A6: http://www.greenbatteries.com sells 1800 mAh NiMH cells at $3.25USD each, 71A6: 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,
73 sold in almost all shops that sell consumer electronics, and in many 74 sold in almost all shops that sell consumer electronics, and in many
74 online shops. Browse around. There's a pretty good comparison between 75 online shops. Browse around. There's a pretty good comparison between
75 different battery makes and models at the digital imaging resource site: 76 different battery makes and models at the digital imaging resource site:
76 http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM 77 http://www.imaging-resource.com/ACCS/BATTS/BATTS.HTM In Germany,
77 In Germany, www.reichelt.de sells GP 2000 batteries for 2,75 EUR (12/2002). 78 www.reichelt.de sells GP 2000 batteries for 2,75 EUR (12/2002).
78 79
79Q7: What kind of run-time can I expect on a set of fully-charged batteries 80Q7: What kind of run-time can I expect on a set of fully-charged batteries
80 when running Rockbox? 81 when running Rockbox?
81A7: For the stock 1500 mAh cells, from 6 hours to 8 hours, depending on 82A7: For the stock 1500 mAh cells, from 6 hours to 8 hours, depending on which
82 which charger was used (see Q3) and the bitrate you use (higher bitrate 83 charger was used (see Q3) and the bitrate you use (higher bitrate means
83 means more harddisk runtime). It depends a lot on the condition of the 84 more harddisk runtime). It depends a lot on the condition of the
84 batteries. With 2000 mAh batteries, you should reach about 10 hours or more. 85 batteries. With 2000 mAh batteries, you should reach about 10 hours or
85 We are looking into implementing more battery-saving techniques in rockbox 86 more. We are looking into implementing more battery-saving techniques in
86 to make it rock longer. 87 rockbox to make it rock longer. If you have a modified AJB with 8 MB, you
87 If you have a modified AJB with 8 MB, you can reach playing times of up to 88 can reach playing times of up to 16 hours with 2100 mAh batteries.
88 16 hours with 2100 mAh batteries.
89 89
90Q8: Can I use different batteries in my Archos? How much playtime would 90Q8: Can I use different batteries in my Archos? How much playtime would
91 I gain by using 1800 mAh batteries instead of the 1500 mAh ones? 91 I gain by using 1800 mAh batteries instead of the 1500 mAh ones?
92A8: Only use NiMH-type rechargeable batteries. It is considered to be safe 92A8: Only use NiMH-type rechargeable batteries. It is considered to be safe to
93 to use NiMH batteries of different capacities though, a lot of people 93 use NiMH batteries of different capacities though, a lot of people have
94 have purchaced 1700 or 1800 mAh batteries to replace the stock 1500 mAh 94 purchaced 1700 or 1800 mAh batteries to replace the stock 1500 mAh cells
95 cells and have the device run a bit longer. 2000 mAh batteries are 95 and have the device run a bit longer. 2000 mAh batteries are just
96 just appearing in shops are equally good to use. 96 appearing in shops are equally good to use.
97 97
98 In theory, running time = capacity of batteries / current drawn by device, 98 In theory, running time = capacity of batteries / current drawn by device,
99 so running time should increase linearly by the capacity, and 2000 mAh 99 so running time should increase linearly by the capacity, and 2000 mAh
100 over 1500 mAh should give 33% longer running time. In practice, the 100 over 1500 mAh should give 33% longer running time. In practice, the mAh
101 mAh ratings are more or less tuned up by the marketing department 101 ratings are more or less tuned up by the marketing department (think of
102 (think of watts on the back of "hi-fi" speakers and amplifiers) and 102 watts on the back of "hi-fi" speakers and amplifiers) and what you
103 what you actually get out of the cells is something else than what is 103 actually get out of the cells is something else than what is printed on
104 printed on them. Check the excellent imaging-resource link above for 104 them. Check the excellent imaging-resource link above for details!
105 details!
106 105
107Q9: Can I use non-chargeable batteries in my Archos? 106Q9: Can I use non-chargeable batteries in my Archos?
108A9: This is not recommended. The unit has been designed to operate with 107A9: This is not recommended. The unit has been designed to operate with four
109 four 1.2V batteries producing about 4.8V at most, and using 1.5V 108 1.2V batteries producing about 4.8V at most, and using 1.5V alkaline/zinc
110 alkaline/zinc carbon batteries will produce around 6.0V, which will 109 carbon batteries will produce around 6.0V, which will heat up the unit a
111 heat up the unit a lot more and might even damage it. The Archos 110 lot more and might even damage it. The Archos manual explicitly tells you
112 manual explicitly tells you not to do so. 111 not to do so. Also, if you connect the charger, it may even destroy both
113 Also, if you connect the charger, it may even destroy both the batteries 112 the batteries and the unit.
114 and the unit.
115 113
116Q10: Can I use a different charger? 114Q10: Can I use a different charger?
117A10: The short answer is: Using a different charger will void your warranty 115A10: The short answer is: Using a different charger will void your warranty
118 and can be dangerous to your unit, so we can not recommend it. 116 and can be dangerous to your unit, so we can not recommend it.
119 117
120 On the other hand, people have successfully used different chargers 118 On the other hand, people have successfully used different chargers with
121 with similar specifications as the stock charger. The charger must 119 similar specifications as the stock charger. The charger must have the
122 have the same kind of connector with same polarity (center positive/+). 120 same kind of connector with same polarity (center positive/+). The
123 The charger should supply at least 7-8 volts, and if it provides 121 charger should supply at least 7-8 volts, and if it provides more than
124 more than 10V, it probably should be regulated to 10V (do not 122 10V, it probably should be regulated to 10V (do not directly plug it in
125 directly plug it in your 12V car battery or it's charger!). 123 your 12V car battery or it's charger!). The universal travel charger
126 The universal travel charger sold by Archos is specified at 124 sold by Archos is specified at 12V, 1.2A so that's probably the maximum
127 12V, 1.2A so that's probably the maximum rating you should use. 125 rating you should use. A good circuit for powering from a car battery or
128 A good circuit for powering from a car battery or other source 126 other source with a higher voltage would be a 600 mA fuse and a 10V
129 with a higher voltage would be a 600 mA fuse and a 10V regulator like 127 regulator like a 7810 of your favourite manufacturer in series.
130 a 7810 of your favourite manufacturer in series.
131 128
132 Inside the Jukebox there is a regulator which limits the charging 129 Inside the Jukebox there is a regulator which limits the charging current
133 current applied to the batteries. The higher the input voltage, the hotter 130 applied to the batteries. The higher the input voltage, the hotter this
134 this IC gets. Don't use an input voltage above 12V. 131 IC gets. Don't use an input voltage above 12V. Using lower charging
135 Using lower charging voltage < 10V will slow down the charging. But the 132 voltage < 10V will slow down the charging. But the rockbox charging
136 rockbox charging algorithm should work then, too. 133 algorithm should work then, too.
137 134
138 These are the output voltages of an original archos power supply: 135 These are the output voltages of an original archos power supply:
139 - connected to AJB Recorder, not charging: 13,7 Volt 136 - 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
162 - use a fuse of ~600mA 159 - use a fuse of ~600mA
163 - using a different charger voids your warrenty 160 - using a different charger voids your warrenty
164 161
165 Many people are happy using an external quick charger which 162 Many people are happy using an external quick charger which is specified
166 is specified to work with NiMH batteries. This is completely safe 163 to work with NiMH batteries. This is completely safe and will not void
167 and will not void your warranty. 164 your warranty.
168 165
169Q11: Can I buy a replacement charger exactly as the one Archos shipped? 166Q11: Can I buy a replacement charger exactly as the one Archos shipped?
170A11: The FAQ on the Archos web site and the top of the charger both read: 167A11: 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:
172 Output: 9VDC 600mA 169 Output: 9VDC 600mA
173 Center positive (+) polarity 170 Center positive (+) polarity
174 171
175 The universal travel charger sold separately on the Archos web site 172 The universal travel charger sold separately on the Archos web site is
176 is specified for 12VDC, 1200mA output. 173 specified for 12VDC, 1200mA output.
177 174
178 Chargers with similar (or user-adjustable) properties are available 175 Chargers with similar (or user-adjustable) properties are available at
179 at shops selling consumer electronics. 176 shops selling consumer electronics.
180 177
181Q12: I often need to stop my player for about 15 minutes or so, and when I do 178Q12: I often need to stop my player for about 15 minutes or so, and when I do
182 it runs off it's batteries. I was wondering, which is best: shutting the 179 it runs off it's batteries. I was wondering, which is best: shutting the
183 player down completely and rebooting it when I want to listen again, or 180 player down completely and rebooting it when I want to listen again, or
184 leaving the unit on? Which way does it draw more power? 181 leaving the unit on? Which way does it draw more power?
185A12: In our testing we found the following results: 182A12: In our testing we found the following results:
186 HDD off, backlight off, idle 94 mA 183 HDD off, backlight off, idle 94 mA
@@ -215,13 +212,13 @@ A12: In our testing we found the following results:
215Q13: When I plug in the charger when the Recorder is turned off, it turns 212Q13: When I plug in the charger when the Recorder is turned off, it turns
216 itself on and starts charging in the Archos software? What's up? 213 itself on and starts charging in the Archos software? What's up?
217A13: There is a switch in the DC IN jack of the Jukebox - when a charger (or 214A13: There is a switch in the DC IN jack of the Jukebox - when a charger (or
218 whatever) is plugged in, the unit is powered on, even if the charger 215 whatever) is plugged in, the unit is powered on, even if the charger is
219 is not plugged in a mains outlet. 216 not plugged in a mains outlet.
220 217
221 If the charger is providing power at this point, the Archos firmware 218 If the charger is providing power at this point, the Archos firmware
222 located on the FLASH ROM does not load a new firmware version (like 219 located on the FLASH ROM does not load a new firmware version (like
223 Rockbox) from the disk, but goes into charging mode instead. You can 220 Rockbox) from the disk, but goes into charging mode instead. You can use
224 use this feature to get to the Archos charger if you want to. 221 this feature to get to the Archos charger if you want to.
225 222
226Q14: When I plug the charger in my Recorder, it doesn't immediately start 223Q14: When I plug the charger in my Recorder, it doesn't immediately start
227 charging the batteries! 224 charging the batteries!
@@ -233,29 +230,29 @@ A14: When Rockbox is running on the Recorder (the device has been booted
233 only when the battery is almost empty. 230 only when the battery is almost empty.
234 231
235Q15: What about the memory effect? Should I be worried about it or not? 232Q15: What about the memory effect? Should I be worried about it or not?
236A15: That depends on who you ask. ;-) NiMH sellers say NiMHs are better and 233A15: That depends on who you ask. ;-) NiMH sellers say NiMHs are better and do
237 do not have a memory effect, but the usual opinion seems to be that 234 not have a memory effect, but the usual opinion seems to be that they do,
238 they do, although it is very small. 235 although it is very small.
239 236
240 However, if you use your AJB connected to the charger all the time, 237 However, if you use your AJB connected to the charger all the time,
241 we recommend you to use the deep discharge option. 238 we recommend you to use the deep discharge option.
242 239
243Q16: When I start my Jukebox, (dis)connect the charger and browse through the 240Q16: When I start my Jukebox, (dis)connect the charger and browse through the
244 directories, the battery level changes a little bit. Sometimes it's even 241 directories, the battery level changes a little bit. Sometimes it's even
245 going up without the charger is connected! What's wrong? 242 going up without the charger is connected! What's wrong?
246A16: Nothing's wrong. The battery level is calculated out of the voltage. 243A16: Nothing's wrong. The battery level is calculated out of the voltage.
247 Because disk spinning, LED backlight, charger all influence the actual 244 Because disk spinning, LED backlight, charger all influence the actual
248 battery voltage, it is usual that the battery level is going a little bit 245 battery voltage, it is usual that the battery level is going a little bit
249 up and down sometimes. This cannot be avoided although we tried to make the 246 up and down sometimes. This cannot be avoided although we tried to make
250 battery level display as little confusing as we could. 247 the battery level display as little confusing as we could.
251 248
252Q17: My batteries are at 92%, the charger is connected to my recorder, deep 249Q17: My batteries are at 92%, the charger is connected to my recorder, deep
253 discharge is off. But charging doesn't start. What's wrong? 250 discharge is off. But charging doesn't start. What's wrong?
254A17: Charging starts if the battery level is below 85%. This is because 251A17: Charging starts if the battery level is below 85%. This is because
255 charging batteries that *are* already more or less full is not good for 252 charging batteries that *are* already more or less full is not good for
256 the batteries and the end of the charging cycle can't be detected safely. 253 the batteries and the end of the charging cycle can't be detected safely.
257 So it's better to start at a level at least as low as 85%. 254 So it's better to start at a level at least as low as 85%. If you want
258 If you want to have full batteries in the morning, leave the charger 255 to have full batteries in the morning, leave the charger connected over
259 connected over night. Charging will then start some hours later. The 256 night. Charging will then start some hours later. The second possibility:
260 second possibility: Use the Archos charging algorithm. At least, 257 Use the Archos charging algorithm. At least, your batteries will be full
261 your batteries will be full one more time. ;-) \ No newline at end of file 258 one more time. ;-)