How big is the battery? Is it heavy?

Mini 5K Apparel Battery

B19G Apparel Battery

B22A Gloves & Socks Battery

BG1800 Gloves 1.0 Battery

BS3250 Socks 1.0/2.0 Battery

Capacity: 4800mah

DC Output: 7.4V / 2.5A

Working Hours: 3 hrs on high, 6 hrs on medium, 10 hrs on low

Weight: 6.53 oz

Dimensions: 3.07” x 2.48” x 0.98”

Capacity: 5200mah

DC Output: 7.4V / 2.5A

Working Hours: 3 hrs on high, 6 hrs on medium, 10 hrs on low

Weight: 8.47 oz

Dimensions: 3.74” x 3.34” x 0.98 “

Capacity: 2000mAh

DC Output: 7.4V / 2A

Working Hours: 3 hrs on high, 5 hrs on medium, 7 hrs on low

Weight: 3.6 oz

Dimensions: 3.01” x 2.11” x 0.8”

Capacity: 1800mAh

DC Output: 7.4V / 1.8A

Working Hours: 3 hrs on high, 5 hrs on medium, 7 hrs on low

Weight: 2.5 oz

Dimensions: 2.55” x 3.15” x 0.53”

Capacity: 3350 mAh

DC Output: 3.0V-4.2V / 0.5A

Working Hours: 5 hrs on high, 7 hrs on medium, 10 hrs on low

Weight: 2.2 oz

Dimensions: 2.80” x 1.50” x 0.80”