Now you've experienced what I pointed out above. Plus, these two posts from the VII forum:
"Battery charge weirdness. The same thing that others have reported with GB ROMs, I'll charge to full, then unplug and be instantly at 85%. If I then replug, I can get to 98%. This may actually just be a reporting issue and the battery IS fully charged, just showing the wrong number. And, yes, I've done two cycles and wiped stats, etc."
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"Also, i experienced the well known 'Android OS' battery drain bug overnight. Before i went to sleep, the battery level was at 28%, and should've been above 20% when i woke up, but the phone was dead. I checked and 'Android OS' was using 23% battery with 90min usage, second only to Display. When i went to sleep 'android os' was only at a few percent. I should also mention the phone was flashed with a fully charged battery. I have screenshots if needed. I've experienced the same battery drain about 5 times over a month's period with GR as well so this isn't anything new, and i've done enough reading to know this bug affects all i9000 based GB roms. I realize this isn't a Serendipity specific bug, but i thought i'd mention it."