Mine should be here in the next couple of days, took the plunge cos i was curious as well, will keep you posted....
The model number I'm testing is
HLI-P6800SL and will cost you USD48.55
Here's the link in case you wanna check it out:
http://search.ebay.ca/search/search....ies&category0=
*FIRST IMPRESSIONS*
1) Battery is exactly same size as the OEM, had no problems with fitting. Initially thought its increased capacity it would be make it a tighter fit, wasn't the case, PERFECT FIT!!!
2) Turned on my PPC without any hitches or glitches

3) Free shipping, makes this even sweeter...
4) Juicing it up, will fill you in with a much more detailed comparative analysis, my girlfriend is a true test of battery power
5) After some extended use, battery is still cool, haven't experienced any over-heating some users claim
*PRELIMINARY RESULTS*
Having spent a full 36 hrs with the battery...the results are encouraging to say the least. Do keep in mind that for Li-on cells to be fully functional, they need to go thru at least 3-5 full discharge-charge cycles and this is only the 1st cycle.
I followed the manufacturer's specifications about the initial 12 hour charge, also take into consideration that this test was conditioned, i.e. I dished out extra punishment, GPS ON for every trip, BT headset on for every call, backlight at 40% (which is pretty bright) and send/receive set at 5 minute intervals.
I consider myself a heavy-user during the day (less at night) with usage being split data and voice even. I receive approximately 40-60 emails a day (some with large attachments) and make out just about as many phone calls. So without much ado, here are my results...
Testing started 09:30 when I initially placed the battery 100% and ended 02:49 when it finally discharged 0% =
17hr 19m window. So in order to rate correctly and/or approximately I took the calculation values (credit hofo_mofo) of my 1500mah battery
Talk time (4.5 hr)
Current = Rating / Time
Current = 1500 mAh / 4.5 hr
Current = 333 mA
Standby (230hr)
Current = Rating / Time
Current = 1500 mAh / 230 hr
Current = 6.5mA
Run time based on my daily usage 09:30/100% -22:23/ 0% =
13hr 13min window
VERSUS 1800Mah
Talk Time = Rating / Current
Time = 1800 mAh / 333 mA
Time =
5.4hrs
Standby = Rating / Current
Time = 1800mAh / 6.5mA
Time =
277hrs
Theoretical 5.4 - 4.5/ 4.5 = 26% more power
vs.
Actual 17.19 - 13.13/ 13.13 = 31% increased capacity
I will be back to update my findings after 5 charge cycles and will note any increased or decreased performance, but for now very promising. If you use an 1100mah or any other type of battery, do the math and the numbers will pretty much tell you if it's a worthy purchase or not. I am not in any way recommending you purchase this battery, just sharing my findings. So until then....
Disclaimer this is by NO means a scientific test and results may not be typical