My battery indicator now gives me the wrong amounts of time left over before the battery is empty. This is the case in both the Unity and Cinnamon DEs (I use both alternately). The upshot of this is that my computer suddenly runs out of power and turns off without warning and without shutting down properly, despite the indicator claiming I have 20% battery or so left.
My battery life has decreased drastically (around 50%). Both of these problems also affect my Windows 7 install.

I hope this isn't going to brick the system at some point (so far, so good - Firefox, Thunderbird and LibreOffice all save their sessions nicely).

It all started after I had a look at ZRam [link] , installed it, tried it, and then uninstalled it as I didn't really need it, and I really have enough RAM anyway. ZRam compresses stuff in RAM so that you have "more" RAM, but the actual compressing and uncompressing stuff for use consumes CPU cycles and thus consumes power. Apparently, Zram was slated for potential inclusion in Ubuntu at some point in the future...

It is not only the battery indicator's fault though: when I look in the "Power Statistics" utility, sometimes it isn't actually measuring the amount of power left in my battery, or still thinks the computer is plugged in, when it's not...

Can anyone help me with this?
It's pretty treacherous... i don't know how to sort it out at all.