Li-Ion Batteries
The Li-Ion batteries used in the XO-1 and XO-AP are excellent batteries for portable, outdoor applications. They have a high energy density (energy per weight) compare to other rechargeable battery technologies (NiCd, NiMH, Alkaline, Gel Cells), are low maintenance, and offer superior performance at low temperatures.
For best performance after long-term storage, Telex recommends the batteries be charged to 30% - 50% of capacity before being placed in storage. This is the typical battery capacity left after a sporting event, such as a football game. Li-Ion batteries retain nearly all their capacity, after longterm storage, if stored in dry, cool temperatures with only 30% to 50% charge. They can lose up to 20% capacity if stored for long term right after being fully charged.
It is also a good idea to charge the XO-AP and XO-1 batteries once every 6 months for three hours then take off charge. Do not fully charge. This helps to maintain the battery's performance and prevent any over-discharging.