A123 battery packs; also known as LiFe batteries, short for the LiFePO4 chemistry used in the cells, from Enerland under the A123 Racing brand. An A123 compatible charger is required for these battery packs such as the Ultramat 14 Plus, 16S or Ultra Duo Plus 50. LiFePO4 cells are more resilient to over-discharge than lithium polymer batteries, however the overall energy density is less than that of Li-Poly based cells and therefore these packs are heavier for the equivalent capacity and cell count.
The nominal voltage of a single cell is 3.3 volts, therefore a 3s pack is said to have a nominal voltage of 9.9v. Compare this with a 3s Li-Po, which has a nominal voltage of 11.1v. The recommended maximum charge voltage per cell is 3.6v, giving a fully charged 3s A123 battery pack a voltage of 10.8 volts. The 2s/6.6V batteries make ideal receiver battery packs, with fantastic capacity retention.
All of our LiFePO4 batteries are built from genuine A123 LiFePO4 cells. Not all LiFePO4 packs contain genuine A123 cells. The cells in these packs have the following voltage characteristics: Nominal: 3.3V, Max.: 3.6V, Min.: 2.0V
Our most popular A123 pack is the 2300mAh 6.6V 2s in a 'Craft' (or 'Flat') configuration - with the two cells arranged side-by-side.