[Q] Proper charging to save battery life on Galaxy S3

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http://forum.xda-developers.com – Please, confirm this information. First question How I know, Galaxy S3 uses lithium-Ion technology battery. This batteries types should be never fully discharged, because the life of battery shortened every time doing that, right? And need to charge them every time it's possible, without waiting it goes below 30% or less? Unlike Ni-Cd batteries, should be totally discharged to set them at full charge cycle again. Another question Battery capacity (for example Galaxy's S3 - 2100mAh), should be charged with max rate charger, about 2100mA or less? If I buy another battery with capacity ~30 (HowTos)