stick with quality cells. Buy some Panasonic NCA chemistry cells from Mountain electronics, illum, fasttech, etc.
examples:
NCR18650PD
NCR18650PF
NCR18650BD
NCR18650BE
are all cells top notch quality should last 10+ years with proper care and are pretty resistant to abuse
they are also much safer then LIPO and can take overcharge, overdischarge, heating, without creating a nasty fire like lipo
They are traditionally charged with a CC/CV power supply with CV set for 4.2 and CC set for, say 1/3 of the cell's capacity per hour.
charging should also stop at 100ma or 50ma in the CV phase.
For lifetime, charge slowly, and use lower voltage (suggestion, 4.10v)