PLEASE NOTE: Batteries ordered with a SOLO target can be shipped with them. Batteries ordered by themselves, must be shipped by ground shipping only. High Capacity Battery Pack. 4,000 mAh, which should be good for about 12 hours of SOLO operation. This item is for a single battery bank. A SOLO system requires 2 batteries. If purchasing a SOLO, it will come with 2. This item is for an additional Hi-Cap battery.