"By 2002, Stuart founded the LibertyPak company based on lithium-ion…

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https://cleantechnica.com/2015/09/09/un-stealthy-energy-storage-company-leaps-stealth-mode-challenge-tesla-powerwall/?utm_content=buffer63ff2&utm_medium=social&utm_source=pinterest.com&utm_campaign=buffer
"By 2002, Stuart founded the LibertyPak company based on lithium-ion batteries incorporating cobalt. Within five years, though, LibertyPak transitioned to another new technology, the even better-performing lithium ferrous phosphate (LFP) platform.

Here are the non-cobalt advantages cited by LibertyPak in its new iteration, SimpliPhi:

Elimination of thermal runaway
No need for ventilation or cooling to prevent heat build-up
Operation at 98% efficiency for over 5,000+ cycles
Up to 100% depth of discharge
Daily cycles for 10 years
Provided 80% savings in operating cost per kWh"

https://cleantechnica.com/2015/09/09/un-stealthy-energy-storage-company-leaps-stealth-mode-challenge-tesla-powerwall/