Mardi 19 mai 2009 2 19 /05 /Mai /2009 13:26

you could be right

mjtimber, . I'm just making a semi-educated guess based on the following news blurb:

"Mil Ovan, senior vice president and cofounder of FireflyLaptop Battery Energy, said “Conventional deepcycle lead acid batteries used in truck starting show sizeable performance dropoff after some 200 deep discharge cycles.” He noted the Firefly Energy battery will deliver greater
reliability and longer service life because it is capable of achieving more than triple the deep cycles while still maintaining over 90 percent of its initial capacity. “In trucking, this means our battery can be expected to last three to five times longer than the best performing valve regulated lead acid batteries..."
Yeah, I saw that chart too. The depth of discharge has a prettydell laptop battery radical effect on cycle life. At a 60% discharge level, the chart shows about 6000 cycles until failure. At an 80% discharge, it looks like 5000 cycles until failure. The chart doesn't mention what constitutes "failure". It also doesn't show actual percent of capacity retained vs. the number of charge cycles, so I have no idea how long theLatitude C610would remain serviceable for day to day use. I suspect the 3D type batteries would have a longer service life in a PHEV application, but that's just a guess until I find the spec sheet. It should be interesting to see which version Firefly uses in its first PHEV application, the 3D or 3D2Latitude C640.Arrgg... well, I guess I can wait a month. Funny that you should mention off grid applications. If these Firefly truck batteries are cheap enough, they may become the battery of choice for off grid applications. Even for people with grid power, a generator-battery combo unit might come in handy during power outagesRather1691P disappointing, actually. The "brochure" on their website indicates about 50% more cycle life, far from the order of magnitude projections they have advertised. It does advertise 45% greater volume per liter, but doesn't provide an actual number. 45% greater than what? A standard lead-acid? The best on the market? It would be 75UYFnice if they provided a little more information

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Mardi 19 mai 2009 2 19 /05 /Mai /2009 13:12

what I've read

From , the 3D cell design that this battery uses seems to be a compromise between cost Laptop Batteryand performance. I'm guessing that they wanted to develop manufacturing capacity and get some revenue coming in as quickly as possible. According to Firefly's website, a more advanced version is forthcoming:

"Firefly is preparing to launch its carbon-graphite dell laptop battery foam grid technology in two phases. In the first stage, dubbed “3D”, the new grid material replaces the conventional negative plate in the battery. This results in some weight reduction (in the area of 15 – 20% for slow discharge single batteries; up to 50% for fast discharge battery pack applications), and a battery that is highly resistant to the effects of sulfation. The second phase of implementing the technology, called “3D2“, replaces both the negative and positive Inspiron 4100plates within a battery with the new carbon-graphite foam grid material. This can result in weight reduction of up to 50% and a battery that is almost impervious to the effects of both sulfation and corrosion, along with many other advantages. For a detailed description on these two modes Inspiron 2500of implementation, visit the “Firefly Technology” area of the website."

From the scant data that I've found, the 3D version appears to retain about 90% capacity at the 600 cycle mark, maybe farther (1000 cycles?). As yet, I have no clue how the more advanced 3D2 version will perform.
Okay, I finished wading through the "white paper" pdf file on Firefly's website. It looks like the holdup for theLatitude CPX 3D2 version involves optimizing the chemistry of the positive plates:

"Conversion of the conventional positive plate to a foam electrode eliminates positive grid growth and corrosion, but it also introduces a different set of challenges. Various foams used in the positive plate are affected to varying degrees when exposed to extreme
overcharge conditions."

"Firefly is actively refining and stabilizing foam chemistry as well as increasingLatitude C600 the robustness of the foams used in positive plates through manipulation of combinations of both foam chemistry and processing, as well as methods of plate preparation. At present, these chemistries and methods are tradesecret intellectual property, for which Firefly is actively pursuing additional patent protection."

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Lundi 18 mai 2009 1 18 /05 /Mai /2009 04:05

how low can you go

Brightness: ? Without any question, the fastest way 310-6322 to suck the life out of a battery is leaving your brightness high. Turn it down as low as you possibly can without needing to up your glasses prescription. On my Vaio, I can select from one of 8 levels. During one test, at brightness level 3 my system reported 60% full, with 3:52 (all times are hours:minutes) of life to go. I switched up to level 5 and in 17 minutes of use, I was down to 52% full, with 3:06 to go. In other words, 17 minutes used 46 minutes worth of D5318 (all other variables were held constant). You can even be so bold as to lower your brightness all the way down when sitting idle for a minute or two (for example, if you are writing a long blog post and pause to clarify your thoughts before typing).
Don’t use any external devices. USB and PC-Cards (aka PC-MCIA) use your battery to function, even when you aren’t using them! Have an EVDO card or maybe a USB mouse? Remove them if you can. Even a memory card reader in your PC-MCIA slot uses power G5260 just by being in there. The effect varies based on the type of device, but even a few minutes here and there (as you’ll see) add up significantly.
Single-task, not multi-task. The more you are doing at the same time with your PC, the more memory and CPU usage increases. Both of which directly use up battery. Close any applications you aren’t using, even the small ones. When doing some experimentation, I found it more efficient to run a single application at a time, then close it and open a new G5266 one when ready to move on. While your hard drive uses the battery too, if you are doing anything ‘productive’ you are probably hitting the drive on a regular (even if infrequent) basis anyway.
Keep it cool. You can take a page out of the extreme gamer’s handbooks, and have your system perform more optimally by keeping it cool. Make sure your air vents (inflow and outflow) aren’t blocked by anything, which often occurs by poorly positioning your notebook on your lap (which is known to have some other side-effects too, by the way). Heavy CPU and memory use all contribute to heat as well, hence my comment Latitude CPi on multi-tasking above.
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Lundi 18 mai 2009 1 18 /05 /Mai /2009 03:44

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