10.4.7: powerbook battery dead after update

Just updated from 10.4.6 to 10.4.7 on my 12.1" PB G4 using the automatic Software Update application and my battery is dead. I tried resetting the PMU but no luck. The battery worked fine yesterday but I can't power-up today. The charging light integrated in the plug remains green but the battery strength only shows 1 rapidly blinking green led.
Coincidence? Anyone else have power/battery problems after this update?
1 GhZ powerbook G4   Mac OS X (10.4.6)  

No problem with my 12" G4 or 17" G4 updating to 10.4.7.
Battery life remains the same as before, machines work on mains power and on battery power.
Note that before updating I logged out, to ensure that no applications were running and all other discs and devices were 'unmounted'; then I logged in again and "Repaired Permisions", using Applications>Utilities>Disk Utility; then did a Restart, and held down Apple+S to start in "Single User" mode, and ran "fsck" to check that all was OK with the hard disc; then rebooted and ran "Permissions Repair" again ..just to be prudent and to be satisfied that the machine was all in good order before applying the system software update.
I'll report back later and tell you if all went well with my Mac mini and G5 quad, but I've never had any problems with any OS update yet - all the way from 10.1 (..and System 8 and System 9 before that..)
Maybe I'm just extra careful.
P.S: Maybe you could try resetting your Power Management Unit ..but note that you'll need to reset your time and date afterwards, otherwise any files you create after that reset will have the wrong time and date, and may not appear correctly in Spotlight searches, amongst other things.

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