Recently my G1 (yeah still use a G1, waiting on the Nexus One Google phone or Sony Ericsson Xperia X10) would just abruptly power off and die during use, especially on process intense apps. Update: I killed the battery in less than 6 months. Called up T-Mobile and PDA Support helped with the first recommendation of battery replacement, which they promptly shipped out free of charge.
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How I Killed My G1 Battery, Avoid My Mistakes!