Originally Posted by Szadzik
#2 will kill your battery very nicely as Li-Ion and Li-Pol batteries do not like being discharged fully.
Thanks for the great advice from 15 years ago when we only had memory-effect-affected batteries.
Most devices won't let you discharge the battery fully for that very reason. Whilst they show you only have 1% remaining, you probably actually have about 6% or something. The other reason they do this is so that the device can shut down gracefully. You never see a phone just turn itself off when the battery runs out, it always shuts down gracefully with a "shutting down..." blinker or whatever.