CANON:
BP-406 , BP-407 , BP-412 , BP-422 , BP-422CL , VCA-422 , VCN013 ,
Keep the canon bp-422 battery contacts clean: Clean your battery's metal contacts every couple of months with a cloth moistened with rubbing alcohol. This keeps the transfer of power from your bp-422 battery pack more efficient.
Exercise the canon bp-422 battery. Do not leave a charged BP422 camcorder battery dormant for long periods of time.Once charged, you should at least use the canon battery at least once every two to three weeks. Also, do not let a LI-ION battery complbu etely discharge. (Discharing is only for older batteries with memory ef fects)