I have 5 Olympus BLS-5 batteries. Two will no longer take a charge, 1 has a 2011 date on it, the other has a 2013 date. The first camera that I purchased that uses these batteries was in late February 2014, so somone sent me old batteries. Of my other 3 batteries, one is mid 2014, the others are mid 2015. I never paid attention to the dates until my batteries would no longer charge. So I purchased a new battery from Amazon that arrived today, the date is 2014-08-06, so it has been sitting on a shelf for 2 years. Should I send this battery pack and request a newer one?