Epson ActionNote - Manual (Page 71)

It takes approximately
1½
hours to charge a completely
discharged battery when the computer is off. If you use the
system while the battery is recharging, it can take up to 6 hours.
If the battery still has some charge left when you start charging,
the time will be less.
If you have additional batteries, it is a good idea to keep them
fully charged so you can replace the battery in your computer
when it runs low. This is especially useful if you are travelling
and run the computer only off the battery; an extra battery or
two extends the length of time you can power the computer
without the AC adapter.
Rechargeable batteries like the one supplied with your
ActionNote have a charge “memory.” If you frequently start to
recharge the battery before it runs out completely, it starts to
“remember” this discharge level. When you use it again, it may
stop supplying power at that level.
To reduce the memory effect and extend the life of your
battery, you should let it discharge completely whenever
possible before recharging it. If you use the computer every
day, you should completely discharge the battery at least once
a week.
If you find that over time the battery is losing its charge sooner,
the life of the battery may be reaching its end. Try letting the
battery discharge completely; then recharge it. If this fails, you
may need to replace it with a new battery.
Note
When your battery will no longer recharge, please contact
your local government agency responsible for hazardous
waste disposal. NiCad batteries are considered hazardous
waste and should be recycled or disposed of properly.
Powering the Computer 4-5