Natural speed, please
Being in the UPS industry, we are frequently asked why the industry hasn’t adopted the use of Lithium-ion (Li-Ion) batteries inside more products. Li-Ion batteries have a much higher energy density allowing them to be smaller and weigh less than half of an equivalent Valve Regulated Sealed Lead-Acid (VRLA) battery currently used in UPS systems.
Li-Ion batteries provide much longer on-battery runtimes and can be recharged faster than their VRLA counterparts. Unfortunately, high energy density Li-Ion battery packs have a number of issues that preclude them from being used in the typical commercial off-the-shelf UPSs. At the present time, with few exceptions, their use is limited to custom UPS products specifically designed for highly specialized applications.
With the large number of cell phones, computers, and power tools now being sold with rechargeable Li-Ion batteries, it may seem a bit odd that their use inside a UPS would be a problem. The primary issues are cost, safety, and federal regulations. Due to Li-Ion battery chemistries having differing levels of danger, the Department of Transportation (DOT) has divided the level of regulation based on primary and secondary battery types. Regulations are also based on levels of energy density. Other applicable regulations are United Nations UN3090 & UN3091.
A primary battery is defined as one that is shipped fully charged and cannot be recharged. Due to their chemistry and high level of charge available when shipped, Li-Ion batteries are considered the most dangerous. The crash of a freight carrier’s aircraft was recently suspected to be caused by a large number of lithium primary batteries that were onboard.
Try splitting your article into smaller pieces. Then different people could all help record it. Right now, it is long, technical, and somewhat intimidating.