Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Olympus camera battery - for Olympus Stylus 840

I purchased 2 replacement batteries. They work excellently. The only problem I had was initially charging them. The charger indicated that each was charged, but when I used them, they only lasted about 2 hours each. I recharged each one several times, with the same results; however, the last time the batteries were both fully charged and are working well, as long as the battery that came with the camera when I initially purchased it. I don't know why my charger indicated the charging process was completed when the batteries were not completely charged. But now everything seems to be working well. And I am extremely pleased with the price - one battery sold locally here at a well-respected camera store was priced at $49, and one at battery only store was $27 for one; I bought these two on Amazon for less than $30, with free shipping.