Which is the best battery app for my Lumia 720 other than battery performance?

[Zekrominfinity]

I am really fond of battery apps and I have downloaded almost all battery apps which are free or with trial option as I don't have my own debit card to register, so can anyone let me to know your views on best battery apps on windows phone, which one(s) you think it is? (With your reason)

 

[xandros9]

I personally keep Battery around (purple icon I believe)
it does what it does well, with minimum fuss, and features others will appreciate when unlocked if you decide to pay.
the live tile with percentage and est. time remaining is much appreciated too.