On my phone the battery runs $60 and is the entire back of the phone (Moto V710). What I did was replace the standard battery with the optional oversize that doubles the capacity. I plug it in each night to keep it topped off and have never had a power problem. These batteries seem to be good for about three years (most folks "upgrade" before then) so I may upgrade my battery to a new one. I was thinking about going to a Moto Razr, but the battery capacity is an issue. Mine has most of the features, it's just fatter.
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Better is the Enemy of Good Enough.
Okay, what’s your point??