enhansing palm battery
1. The Tungsten T's charging system is optimized for 3.7v Li-Ion2. Make sure the Tungsten charging circuits can safely charge large, unknown manufacturer battery. I will be initially be connecting the battery via a pigtail that will allow me to place my Tungsten on its cradle with the battery a safe distance away in a metal tray. At that point, I'll attempt to charge it with my Tungsten. I'll be carefully looking at the amount of heat created as well as whether or not the T3's charging circuitry correctly recognizes the charge level of the battery.
Then I'll simulate regular and high power demand use (surfing via bluetooth) and repeat the above observations. Only if this experiment works will I adapt my PDA to fit it.
Don't just solder this thing in and hope it works folks.... Li Poly batteries can explode if charged incorrectly!
3. But in Igor's opinion, it will work without any problems. Lithium Ion Polymer Cells have built in protection circuits. They limit the voltage threshold, so that overcharging does not affect the battery. The circuit is inside the battery, not in the Palm's hardware. Lithium Ion cells are standard, 3.7 volts. They usually require 3 hours of charge. So, your PDA will not recognize it as a new battery, it will 'think' it's your old battery.
4. How do you know the Palm hardware would interface properly with the 3rd party batteries? There is no standard protocol for battery circuitry design as far as I know. Many manufacturers use their own proprietary battery monitoring and charging circuitry.So one should never take it for granted that they would work correctly. The best would be if we can find a way to monitor the charging parameters (like what we can do with Field Monitoring mode in Nokia phones) such as Voltage , Temperature, Current.... readout. Then we know that the monitoring circuitry is ciommunicating properly.The other concern is the quality of the 3rd party program especially if you know nothing about the manufacturer. All the exploding cell phone batteries are of 3rd party or counterfeit Li batteries.
5. Manufacturer suggested quick charge rate is 1C for one hour. You can use 2C, but it will shorten the life of your battery" For those who don't know, C is charge rate as a fraction of the capacity. For instance, 0.3C means "three tenth of the rated capacity".Now, what do we have? Standard Palm charger has 5V 1A and it has been sucssessfully charging YOUR BATTERIES, which are 3.7V 900mHa BTW, for QUITE LONG TIME. So, 1.2Ah is pretty much SAFE.
6. In case of Li batteries charging, careful control of charging current is very important. You need precise voltage and temperature readout from the built-in circuitry in the battery. Most of all, the charger must be able to determine exactly WHEN TO STOP. You cannot trickle charge Li batteries, and there is real danger of explosion when overcharged.So the "1C" "2C" "950mAh" "1.2mAh" are not the issues here, the question is whether it has a compatible in-battery monitoring circuit.
7. Well, I see what you trying to say. Are you sure that there is a charge controlling circuit in the charger? I don't think that charger has anything of that nature, because otherwise the charger would stop the charging process and SIGNAL YOU ABOUT IT (the only way to say to you that the battery is fully charged is to turn the green indicator light off, isn't it?), but instead the light is always on, no matter how long a palm's been in the cradle. IMHO if they had put that circuit in the palm charger, they would have called it something like "a new modified charger with a built-in advanced microcontrolled board that has enhanced..." and charge you more money for it.
8. Lots of research has been made on Lithium Ion batteries. We have to follow some steps in order to charge and use them safetly. Some manufacturers opt for safety, usually the big name ones, like Samsung, Sanyo, and others. Smaller manufacturers, in order to sell more, choose creating a more powerful battery, in exchange of the safety. But that does NOT mean their batteries aren't safe.To raise a Lithium Ion current, they impregnate the eletrolyte with nickel, generating a more powerful battery. The safety decreases only in case of puncture, exposition to fire and other extreme cases. It's still safe under normal using conditions.Lithium Ion technology changes every six months, so that they're always finding ways to improve its charge/discharge cycle count, safety and higher currents (not necessarily in this order).
9. The battery is wrapped in some sort of aluminum foil. Can I get rid of that wrapper?
10. Well, while I`m waiting 'till epoxy hardens, I just wanna tell you guys DO NOT TAKE THE WRAPPER OFF! Battery literally breathes - after applying epoxy, air bubbles come up. Rather, it is not the air, its electrolyte. don't take the wrap off! It's the only protection of the battery! !
11. I've read that LiPoly batteries are "shapeable" to fit odd spaces.What if I was to put a vice to the battery and carefully squeeze it down by 2mm. I could even build a form that would allow for a precise re-shaping of the battery.Can Li-Poly cells be re-shaped after they are manufactured or does this property only apply to the original design?This battery definitely is maleable; it has putty-like properties as you handle it.
12. I'm certainly not an expert in this area, but I have been able to "squish" mine down just using my hands and a ruler to a 35mm width. I wouldn't be brave enough to put it in a vice, however.
13. Yep, I concur after finding that out for myself. That works just fine.I have successfully placed this battery into my T3 folks. Fits like a glove. (hopefully I'll be able to get the case back apart to remove it again).... those little tabs are a real bear to separate....
14. I can't stress enough the need for proper charging circuit precautions. Here's the fine print on the fact sheet that Balsa Products sent along with the battery regarding their policy with LiPoly batteries:Caution: When charging and discharging your Lithium Polymer batteries it is very important to follow current limitations for each cell type as outlined on our web site. When charging your Lithium Polymer batteries you must use a charger that supports Lithium Polymer technology. If your charger does not support Li-Poly batteries it is possible to permanently damage your Li-Poly cells. Crash damage can short out a cell internally. Be careful to monitor the cell temperature after a crash. do not use a dented cell after a crash. do not attempt to recharge a damaged cell. do not store a damaged cell. Immediately discard damaged cells in a safe manner. Li-Poly cells are capable of storing tremendous amounts of energy and should be respected. JST connectors are rated for 3-amps. Using higher than 3-amps may cause your JST connector to melt and short out your Li-Poly battery. We cannot assume responsibility for this kind of damage. Limited Liability: We cannot ensure that you observe the proper precautions when using your Lithium Polymer batteries and charger. Nor can we supervise the operation or application of your Lithium Polymer batteries and charger. For this reason, we cannot accept responsibility for any loss, damage, or injury as a result of improper installation, use, or operation of this product.
When a Palm takes a dive in pool or toilet, and if you immediatly open it and dry, it will work. The only part that won't work is the battery, and has to be replaced.
15. Is it possible to simply drip melted solder from the iron onto the wire/lead and get a decent connection? In my experiments so far (soldering wires to aluminum foil and dimes) it hasn't really worked out well, but I wasn't sure if that was just the materials I was using. The only really good soldered joints I've gotten have involved heating up the materials together and then applying solder, however this takes longer than the 5 seconds recommended by the battery guides, so I am really wary of doing that.
16. battery has overload protection built. My point is that this circuit board provides an "interface" to the Tungsten circuits that must determine the amount of charge remaining on the battery. I believe that it was custom designed by PalmOne to provide the extremely accurate charge level information that a PDA requires to properly manage the battery. a 1200 mAh battery will do you no good if the T3 decides its at 10% and switches off the device even though you actually have 50% charge remaining.
17. BatteryGraph is a program for monitoring battery status on a Palm OS compatible device.
18. New 1200mAh Battery: $15.50Basic Soldering Set: $7.99Precision Screwdriver Set: $4.99Broken Tungsten T off eBay: $17.45Getting an extra 1-1.5 hours out of your T3: Priceless (nov 2003)
18. As for the circuit board, the consensus seems to be that it IS necessary, because it is not circuitry to prevent overcharging, but a circuit that allows the palm to monitor the battery. So USE THE CIRCUIT BOARD.
19. IT SEEMS THAT PALM BATTERIES IN PARTICULAR HAVE A CIRCUIT BOARD ALONG WITH THE REGULAR BATTERY. THAT IS WHY THESE BATTERIES ARE BIGGER THAN THE BATTERY WE GET IN THE MARKET OF THE SAME POWER. MAYBE I COULD SCAVAGE THE CIRCUIT FROM MY DYING/DEAD PALM T2 AND USE IT LATER (RINKU- SEP 11- 2007).
20. Every li-ion/li-pol battery is charged using CCCV method (constant current/ constant voltage)
21. Arguing with an idiot make sure he isn\'t doing the same.
22. 400mhz is immense pwer, wouldn't 200-300mhz be enough for full screen hi-quality movies?
23. Well, it mostly depend on the frame rate, if you use original frame rate 20...25 fps, - i probably do need some cpu power
24. I'm not sure I understand your question, but I'm interpreting it to mean: "Do I or Do I not need to solder the battery circuit board to the new battery?".If that's your question, then the answer is IMHO yes, absolutely, on any T series you do need to. It might work without it, but the battery fabrication time is minimal compared to the problems you'll need to overcome getting everything back together again. In fact, using the circuit board will help prevent shorts as there will be no way the + and - tabs will be able to come in contact with each other due to the fact that they're soldered to opposite ends of the board.
25. you need to solder the board to the new battery before attempting the odyssey of reassembly.
posted by Surinder Rinku @ 4:15 PM
