I purchased this item as part of my "starter kit" along with a Kangertech T3S. My question is, how long should I expect this to last. Does this battery have a normal life span. Currently I am recharging about once a day. I "assumed" this was going to be a permanent piece of harware, but the more I learn, I think I may be incorrect in that assumption. Looking for some guidance and advice please and thank you.