03-14-2010, 01:07 AM | #31 |
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03-14-2010, 01:38 PM | #32 |
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Good, I expect it will be the same for these. The JBL power indicator doesn't give
us much info. What I am planning for the test: I'll be comparing these "Ansmann" "maxE+" NiMH 2500mAh batteries (Made in China) charged with a "Powerex" MH-C204W charger overnight (at least 12 hours) - against the very common "Energizer" NH15 1.2v HR6 2300mAh batteries (Made in Japan) charged with an "Energizer" Model CHDC8 charger for about 3 hours. The test run will be from installing the batteries until the replace batteries warning box appears on the JBL. I will record the install date and time, the date and time for the start and end of each period of use, and the date and time of the warning message. From that we should see the actual performance between the two batteries tested. ( The actual use and standby times will vary for each run, so it won't be an exact comparison but will reflect normal usage.) I plan on posting the results after each of the first two runs (one for each battery), then do four more runs, so I can average the results, before posting a summary. I will also, record and report the period from the removal of the battery set, from the charger, and its use on a test run. Luck; Ken Last edited by Ken Maltby; 03-14-2010 at 01:58 PM. |
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03-15-2010, 08:05 AM | #33 |
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Anybody have anything to say about these?
http://www.thomasdistributing.com/sh...rje23bagil4pd3 It would appear on the surface to be an ideal setup. |
03-15-2010, 10:13 AM | #34 | |
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03-15-2010, 12:44 PM | #35 |
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4x1.2=4.8v 4x1.5=6v 4x1.6=6.4v was the worry. It was pointed out that the
JBL has a power regulator, so it should handle the difference in voltage, but there could still be an issue of how the JBL handles the discharge curve. You would expect that it could do a little better than the 1.5v primary batteries, but who knows? I haven't encountered the lock-up that some reported, but these new batteries could be a way to avoid that, as well. I've wanted to try these, myself. (Three sets of batteries and chargers? Well why not? I've got a few things that use them.) Thanks for the heads up. Luck; Ken Last edited by Ken Maltby; 03-19-2010 at 11:05 PM. Reason: should have been "Regulator" not "Rectifier" |
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03-15-2010, 01:05 PM | #36 |
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Well Ken it seems to me that the 1.6v dropping over discharge rate would just work better long term than the 1.2 of normal rechargeable batterys. I think if in a few more days I've not heard any reason not to try them I'm going to go ahead.
Will let you all know how it goes. |
03-15-2010, 09:28 PM | #37 | |
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Quote:
Great, and if you don't have any bad surprises, in say a week of use, I will grab a charger and eight batteries, myself. I'll also add three test runs of those to what I'm doing now. (After I finish, these.) Luck; Ken |
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03-15-2010, 10:26 PM | #38 | |
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03-19-2010, 10:50 PM | #39 |
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I ended up using some rechargeables that I'd gotten for my wife to use in her camera. Kodak brand from WalMart, nothing special and about 2 years old. Lasted about a week, one bar down, then about 3 more days and it went to 1/2 (2 bars).
Remembering the problems that some folks had if the batteries died while in the reader, when it hit 2 bars, I swapped them out for another set of rechargeables that I picked up at Target, 4 for $10 (Radio Shack wanted $20 for 4). Can't remember the brand, Everready or something like that. Labeled as "green" We'll see how they do this week. I usually read about 2 hours a day, not all at once, 10 mins here, 20 mins there, whenever I get a chance to sit down for a bit, I grab my JBL. |
04-08-2010, 06:44 PM | #40 |
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Ansman "maxE+" 2500mAh first test run
Removed from charger (overnight charge) 14 Mar 1649hr
9 days 6hrs of shelf time later: Installed 23 mar 2300hr (showing full charge in JBL) at the 6hr 25min of reading point dropped to three bars at the 21hr 34min of reading point dropped to two bars at the 21hr 40min of reading point the low battery warning appeared [ending the test run] on 08 Apr (batteries test at 1V and in the "?" to the edge of the "Good" in the 1.5v battery test function) SO; 21hr and 40min of actual use time and ~16 days standby time. ---------------------- The JBL's power monitoring may be limiting the useful time of rechargeable batteries in general, but these tests show what each battery type tested provide running under the 0.15 firmware. It appears the dropping below 4v triggers the replace batteries routine of the JBL. I have started the testing of the 2300mAh Energizer rechargables which were given a regular 2hr charge on 14 Mar. Giving 24days 16hrs of shelf time, before they were installed at 0140hr 08Apr. They show as full in the JBL. My order of NiZn 1.6v rechargeables and charger are due tomorrow and I'll add in their first testing run after this energizer run. Luck; Ken |
04-16-2010, 08:43 AM | #41 |
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Waiting patiently for your "test results" of both the energizer and the 1.6v rechargeables. I want to get rechargeables, but want to buy the best for my money. Thanks for your tests.
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04-16-2010, 06:11 PM | #42 |
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I am near the end of the first Energizer test run, I think. (They are at 20hrs and 3bars)
I'll post here the Energizer final results of their first run, just like I did for the Ansman eMax+ first test run. The next test run will be for the Made in China PowerGenix NiZn 1.6v 2500mAh. I'll post the results of their first test run, as well. Then I'll make two more test runs for each of the three and do a summary post in its own thread with the averaged results. Last edited by Ken Maltby; 04-16-2010 at 06:58 PM. Reason: Rechecked my data on the energizers. |
04-17-2010, 09:15 AM | #43 |
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I have not been scientific about it, but I'm getting about 6 days on average with my JBL and the NiZn rechargeables. Almost double what I used to get with a Jetbook.
And best of all, when it gives me the low battery warning, I just go swap out the battery's and go back to reading inside 5 min. Instead of having to put it on charge for 4 hours. |
04-17-2010, 04:08 PM | #44 | |
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LSD (like Eneloops) vs. regular NiMH - "few weeks of storage" crossover point
The crossover point where a typical LSD (low self-discharge) is longer-lasting than a typical traditional NiMH (with its higher capacity), is given by this heuristic on Wikipedia:
Quote:
I over-analyzed from this tiny sample by doing the following crossover point calculations using the charts in that reference (white charts for Eneloops, scroll down for pink charts for traditionals):
Assuming approximately a straight line storage discharge curve (taking some liberty when looking at this site's non-linear NiMH Battery Retention Curve), we come out to approximately three weeks of storage, whereupon a 2000 mAH LSD NiMH retains more capacity than a 2500 mAh Traditional NiMH. |
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04-17-2010, 07:17 PM | #45 |
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I've been recharging my NiMH Duracells three days before I expect to need them. May I assume that they lose close to nothing during that three day period?
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