Many Flex tools perform extremely well in our tests ... We bought all four tools with the standard battery and charger. While ...

It is the unspoken law of cordless tools – eventually ... facing this dilemma with a Makita battery from a broken angle grinder and decided to make a USB charger out of it.

Flex's cordless impact driver is one of the brand's 24-volt power tools, which can all be powered by beefy, proprietary lithium-ion batteries and state-of-the-art chargers.