Safety test of Samsung 2600 mAh lithium batteries used in e‑bikes. We test overcharging, short circuits, punctures, and extreme heat to see how protections work and how dangerous damaged lithium cells ...

Optima builds deep-cycle (above, left), and dual-purpose (right) lithium marine batteries the author tested for engine starting and light "house" duty. Courtesy Optima Batteries Last fall, I replaced ...