I use this ATV battery backup for my smartphone. When it is very cold, my phone only holds 2:30 (GPS + network). The battery is essential. Housed in a tube end and housed in a former bomb velcro fastening anti puncture it is near the such. Battery use time by 0 ° C is 3 / 4:00. Very satisfied with the product for its size and is also suitable for my job that requires many calls away from any charger ...