Standard battery for the XPR3000e and XPR7000e Series - Temporary alternative model PMNN4543A (non-IMPRES) battery will ship in place of the PMNN4491C. The IMPRES semiconductor chips are not available to produce the IMPRES capabilities of the 4491. The 4543A has a slightly higher capacity (2450 mAh Li-Ion) and will be sold at the same price.