The 1500 mAh Lithium-Ion battery would not hold a charge nearly as long as the 900 mAh nickel hydride battery that came with my Nokia 5185i phone. It is the only vibrating battery I've tried, but if this is what they're all like, the feature is of no use to me, since the vibration is not significant enough for me to notice it when the phone is in my pocket. The display on my phone malfunctioned twice, requiring replacement of my phone, during the two weeks I used this product. I cannot say that this battery was to blame, but I certainly suspect it.