Keeping my iphone 4s charged help? Stupid thing runs out of battery so quickly?

Any tips on keeping my iphone charged. I use it for business so as a small business owner in real estate I'm quite a talker texter but my phone can't keep up. The stupid battery runs dry by 10am if I start calls etc at 8am. Any suggestions as to extending the charge life? I'm not that proficient in any technology so not aware of the tricks but seriously even if I just take a few calls and run an internet search there goes the battery.

Turn down your brightness and deletes what Evers in the multitask bar

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