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My inverter fuse is not blown yet the red light and beep continue

Today i was reinstalling my inverter at my new home after keeping it off for one year. i first charged my battery externally and completed the installation process. but two exceptions are observed - one, battery charged status not shown even though battery backs up when current is off; second, fuse is shown as blown and beep continues even though fuse is alright.

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a 13 year old relic of the past pulled out of the attic or found at a garage sale for 50 cents.?
hp has no support for this, its now a relic retired state there.
some have 2 batteries , one is soldered down. oops.
first google hit.

google finds then non HP manual , that HP deleted.
here free, give the new batt. 4 hours to charge.

read page 27 , carefully and the gravity of these words

"Keep the battery charged.
The programs and files you install or create are stored in volatile RAM memory. If the battery
completely discharges, all user-installed programs and user data files
created will be erased and you will have to reinstall them. To prevent
losing valuable programs and files, keep the battery always charged.
Optionally, you can store a limited number of programs and files in the
iPAQ File Store folder so that if the battery completely discharges, they
will not be lost."
the store, is a NVram?, not flash. and the STORE has a battery
what is the chances of any 13year old battery still good.(zero?>)

see the coin cell here, it unplugs other models are soldered down.

1710-0bqeoaofrldpq4t1wllrhfnq-1-0.jpg why spend cash on old relics like this. and labor?
so you learned to day it has 2 batteries not 1
and learned it is 13 year old relic of the past, 100% useless in todays world. (buy notepad new for $50 at walfart)

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