Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: totalis on December 26, 2010, 06:25:03 PM
-
If enough people show interest i will make one
I have had success with both the batteries and charger.
The batteries are much lighter and only mildly more expensive than NiMh
The charger was cheaper than the one i have for NiMh
The downside is the consequence for mistakes as lithium doesnt play nice if not used properly ...
anyway, Reply with interest :)
Merry Xmas
T
-
Hey, merry Christmas, I would be interested in that tutorial.
-
yep make the tutorial
once you publish it more people will read it.
-
sure...cause im currently looking for some stable battery pack to power my new craze..! ;)
-
Li-ion, yes. Actually, now I am looking for some info about Li-ion charging :]
-
I would love to see this, as I'm looking for some battery for my robot.
-
I have attached the rar of all the files.
I have taken photos of my process of making a phone battery robot friendly.
Basically you start by removing the packaging of the battery; for this particular model (nokia 9500) that involves removing the thin packaging from around the outside, this is not a necessary step but i needed access to solder, and the final battery is smaller.
Pay attention to the plus and minus markings.
Then remove the supporting plastic, being careful not to touch the wires together.
Fold the electronics down so the space isnt wasted, and cover in insulated tape.
There are 3 contacts on top of the battery, one positive, one negative, one is unused but pulled to ground (i think) Dont solder to the centre anyway.
Next you need to prepare the wires, I have included the jumper so than i can stack the batteries, to increase the voltage. Also it is an on off switch.
I initially soldered a pin to the negative terminal and the negative wire to the other half of the jumper, being careful to isolate the centre pad.
I then soldered the positive wire onto the pad, and attached the 0.1" connectors.
Finally the battery is wrapped and ready to go.
These batteries are charged from mobile phone battery chargers, for instance, the 2 i have are for charging HTC Desire batteries.
The batteries cost .99p from ebay, the parts cost a few pence. The chargers cost £3.50 ish, but its a one time investment.
It is useful to have more than one battery as it can get confusing as to which terminal is which.
It also means you can drop the voltage to 5v.
http://dl.dropbox.com/u/5224931/Li%20Ion%20Tutorial.rar (http://dl.dropbox.com/u/5224931/Li%20Ion%20Tutorial.rar)
-
yes please do. i currently use niMh but would like to try Li-Ion if i knew anything about it.
much thnx
-
I haven't read it all yet but might be of interest
http://www.sparkfun.com/tutorials/241 (http://www.sparkfun.com/tutorials/241)
-
Can you share with us a list with comparison, for example you say something that the battery is more lighter - with what percentage is more lighter? or there is no formula?
-
It would be nice to know the exact size, weight, capacity, and current output compared to nimh and alkaline.
-
Hi,
Here's (http://www.nexergy.com/media/pdfs/batterychemchart.pdf) a pdf detailing the energy densities of different chemistries.
And a graphical chart (http://www.nexergy.com/battery-density.htm) from the same site.
-
I wrote a Tutorial a year ago for a friend that had a bunch of cable modem Lithium Ion batteries lying around. He sent me a few and I showed him how to rip out the cells and make a usable battery from them, complete with a protection board that makes Li-ion packs pretty fool proof.
http://www.billporter.info/build-your-own-li-ion-battery-packs-from-leftovers-tutorial/ (http://www.billporter.info/build-your-own-li-ion-battery-packs-from-leftovers-tutorial/)
The resulting packs are 14.4V @ 2.2Ah and cost me $10 to build, since I already had the cells. I use them in most my projects from my multiple robots to my LED lab coat. They work great, and the PCB board will cut power if they drain too low or if I do something stupid like create a short or draw too much current at once.