To help define exactly how lithium-ion batteries work, PTR independently interviewed two men we truly respect in the industry: Paul Fry from Milwaukee Electric Tool Corp and Jason Feldner from Bosch Tools. There are other experts, but we know these guys and have been fortunate enough. Jason: For the first time, lithium-ion batteries enabled smaller, more compact, tools to actually do like 80-90% of the work needed. A lot of driving applications simply didn't require 18V tools. and this was a real wake-up call. The “pocket driver” was born. It really went. PTR:Can you tell me how lithium-ion batteries work now compared to the technology from your 1st-gen batteries? Paul:Well, the. PTR:How do you approach battery design—from cell selection to electronics and the actual packs themselves? Jason:Certainly, you. Jason:Lithium-ion technology has changed with regards to the role the battery cells play in the system. There are three components to a lithium battery pack: the battery cells, the.