7.4V 2200MAH/3000MAH Rechargable Lithium Polymer Batteries,US Standard Dual Charger, USB Cable for Heated Gloves Socks Hats Balaclava Thermal Underwears (7.4v 2200MAH Lithium Polymer Battery Pack)

These provide a significant improvement in the working time of my heated gloves which came with 2000 mAh batteries. Although these batteries are 3000 mAh, which is only 50% larger, they extended the time by nearly double. Perhaps my older batteries, which were used all last season, were starting to wear out. These batteries are larger and I was worried they would not fit in the zippered compartment, but they fit just fine. The gloves are now a bit heavier, but it is a pleasure to be able to work outdoors for six hours with my gloves turned up to high. Just finished a day outdoors at 6°F and my gloves worked well the whole time.