[Kmpres] takes us through the process of building a desulfator. A desulfator works by putting high voltage pulses into the battery forcing the sulfate crystals to dissolve back into the electrolyte.

Hack a Day favorite [Mikey Sklar] is back with a new project. Mini-D is a battery desulfator. If a 12V lead-acid battery sits with a voltage below 12.3V, sulfur crystals will begin to form on the ...

Are you sexually creative? Find out who you really are between the sheets with this sex personality test. Examine the following statements and indicate how well they describe you. In order to ...

In response to criticism that the test is not a reliable assessment tool, psychologists have worked to improve and validate the Rorschach over time. They have developed standardized protocols to ...

Test your broadband connection speed. Our speedtest works on the vast majority of web browsers and devices, including computers, tablets, phones and games consoles. If you are experiencing ...

Write it Out Audio (7:38) Get rid of worries before the exam - A guided practice that clears out worries from the mind; research shows it has increased test performance by at least 5 points. Walk Off ...

While you can get tested at a doctor’s office or a clinic, at-home test kits offer another good option. Testing for STIs at home is convenient, discreet, and reliable. An STI is considered an ...

If you’re looking for a compact and portable battery charger, maintainer, trickle charger, and desulfator all in one ... maintainer will withstand the test of time and continue to work ...

Give your broadband connection a quick test to see if you’re getting the internet speeds you’re paying for. Trisha Jandoc is an associate writer at CNET covering broadband and everything ...

A t-test is an inferential statistic used in hypothesis testing to determine if there is a statistically significant difference between the means of two sample populations. A t-test is an ...

Here's how we test every laptop that hits the bench at PC Labs using 24 different benchmarks. I’m one of the consumer PC experts at PCMag, with a particular love for PC gaming. I've played games ...

Don't just go by your provider's promise on broadband speed. Use the Which? free speed test to investigate. Here we explain how to use the speed checker. If your broadband isn't as fast as it should ...