I have this ego battery (1000mah). It's only about 4 months old. It's my "go-to" among the 3 I use. This stupid thing just doesn't charge right! I can plug it in at home and leave it for 5-6 hours and the light is still red. Then I take it to work to finish it up and it's done in about an hour. I charge all my batteries in the same outlet using the same charger. The other 2, charge as expected. Today I brought my "go-to" (my favorite pink one) and it's been charging since 7:15 this morning! I'm getting paranoid that it's gonna blow. What gives?