HK turnigy lipo started early 2010 for me, my main test rig is the Norc Chaos on 100v 5ah with a 55 amp controller. That pack was used for 2 years, bulk charged with meanwell supplies to 100.0v ( giving a range of 4.13 to 4.18v per cell across 24 cells ) .. occasionally ballanced charged with an Icharger 3010B but over 2 years of this i've discovered that the icharger ballance cycle was not needed as the cells always return to their voltages pre-ballance almost right away, but it served a learning purpose.
if you have healthy cells in your pack, a BMS and ballancing is not required..
Discharges going to work and back = 9.6km = +/- 3ah average per cycle ( from 5ah cells at 10C peak, 2C +constant from 20C packs )
work 5 days a week *( and a few cycles per day on the weekends ) , 2 years, from april to dec = 500+ cycles over 2 years and the packs are still working, i have to perform a capacity test and report back but i have 1 cell that limits the others on the most + side of the pack. always that same cell that dies first.. not sure why.
I installed 4 fresh packs on the nocro this year for commuting as the 2010 cells are showing their age but still work fine and are used for secondary packs on my other bikes ( the BMX, rang extender for longer trips in a backack, etc etc etc.. )
All my bikes have Cycle Analysts, that is how i keep track of voltage, ah, etc. on the bikes, i also use CA's on my chargers to keep track of charge profiles and behavior. (no BMS on any of my packs )
my PSI cells ( 10ah Lifepo4 cylindrical cells ) have been in service since early 2009, not that many cycles on these, they have been used on the chopper, on the BMX in a backpack, various projects of the years , accidentally drained to 0v and revived, more than once, and still work...
A123 i have not used very much, only a few 26650 cell packs here and there, but no data to report on those..
i present my projects page with LOTS of data to read thru for anyone interested in knowing details of all this.... blogged as i go.
Then i add 10,000 posts here on ES, reading and writing daily other's findings and results, and imo... start with quality cells, do a preliminary QC check and make sure you dont have runts in the pack, manually monitor them carefully all the time, any lithium chemistry will work excellent for you.
Avoid, ebay, lowest priced cells, packs spot welded crappily, bad chargers, BMS's ... i hate BMS's... they have caused me more cell failures than they have saved packs.. arg..3
This pack is still in use :http://ypedal.com/EBK/ebk.htm
been abused, lent to customers *( heavy usage from one guy for 6 months ) cold tested, heat tested, dropped, and still keeps on ticking.. i have to get it back for a capacity test from the local customer who is currently using it.
All that being said, you can kill a pack with a single day of bad usage, if you try hard enough.. be it lifepo4, limn, lico, rc lipo, nimh, nicad, or lead acid... no matter.. severely overcharge it, drain it flat with a hard over-discharge, and there you go .. 2000 cycle claims worth nothing if you ruin a pack by being a jerk.... like tools... use as intended..
edit " fixed typo's..