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How should i charge the xperia miro so that i can maximize battery life? Should i let it drop below 20% and charge it till it gets 100% or should i charge it whevener till the light gets green?
You should not let the device discharge completely as it can take a longer time for you to power on the phone since the battery is flat.
Recommend that you check the user guide for Sony Xperia Miro on page 13 and further. You can find the user guide at the following link: http://www-support-downloads.sonymobile.com/st23/userguide_EN_ST23i_1265-3544.2_Android4.0.pdf
You can also check our FAQ about battery time and enhancements features:
http://talk.sonymobile.com/t5/FAQ/Battery-time-and-enhancements-features/m-p/347874#U347874