The best alternatives to Battery Thing are FIPLAB, Battery Buddy, and Battery Indicator. If these 3 options don't work for you, we've listed a few more alternatives below.
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FIPLAB is an award winning application development studio in London that specialises in creating intrinsically viral, high quality iPhone, iPad, Mac and Windows 8 applications.
Are you tired of your MacBook battery dying on you while you are doing important work? Discharge app is made for you. Get a clear in-your-face critical battery alert before your Mac runs out of battery. The warning visual system is such that you can't miss it.