I don't want my laptop's battery to always be at 100% because it lessens battery life, especially when above 25 Celcius, the lowest summer temperature in Israel (currently 30C - 32C). I prefer to keep the battery level between 30% and 50% and use it instead of a backup UPS battery. Is there any software that can do that?
If there is no software, can I wait until the battery reaches 100% charge, pull out the power cord and work in battery mode until it reaches 10% so Windows 7 will let me know or will automatically hibernate? Moreover, the battery can protect against brownouts and power outages.
Will having the battery with the power cord plugged in degrade battery life faster than unplugged? Would I be better using UPS? Will UPS be cheaper over the long-term compared to a laptop battery?