I'm using some LG HG2 batteries that are well over a year old, and they are still going strong. I have one battery that I know is over 2 years old, and is still a good battery. The brown LG HG2 batteries are 3000mAh batteries, and are rated at 20A, I run them in all my mods even in my 160w mod. I don't run high wattage, and they work good and last longer. The max your Pico will put out is 60w so they would be a safe battery to use.
I guess your Pico is 75w, should still be safe, unless you run a coil below .2 ohms.