A123

A123 Systems was one of the first to commercially introduce Lithium Iron Phosphate (LiFePO4) batteries. The original company is now defunct and it's assets are owned and operated by Wanxiang.

This page is primarily about their LiFePO4 26650 batteries, in particular the ANR26650 originally introduced as the m1-A and superseded by the m1-B.

A large lot of these batteries, over 100,000 cells, were removed from an industrial power grid scale deployment and are being re-used/re-cycled for various applications. The Bayview Boom in particular is using these as part of their program to build bicycle boom boxes, they were recently featured here Burning Man Journal.

The majority of these pulled "units" are in AES Module Energy units rated for 736 watt hours each and comprised of 96 cells in a 12S8P configuration with a custom Battery Management System (BMS) board. These units are "bad" and have failed the requirements testing for their intended application. The vast majority of cell however have been tested to still provide 80% of design capacity.

{TBD teardown and testing procedures for units to go here}

Part of the BMS contains two MCP9700A thermal sensors. These sensors provide a linear voltage feedback for monitoring temperatures within the pack.