Camera - a fragile thing, prone to all sorts of harmful influences. If you want it served lithium ion battery stocks for a long time then pay attention to the mechanical structure. If the shell metal, then at least not crack if dropped. There are models designed to operate in extreme conditions. Traditionally Pentax pays great attention to protect their equipment from the adverse effects of the environment.
If you work for long hours on your laptop then the temperature inside the laptop can rise which affects the battery-life. This occurs due to cell oxidation inside the battery and this plays lithium facts a major factor in reducing the lifespan of the laptop battery.
All the phones now come with lithium ion batteries and charging should not be an issue ...although it's best not to charge them over 24 hours..Overnight every night is fine...they all do have a life though leaving it off when you don't need it can extend that. Although you would miss calls.
You lithium bettery stock do not need all the sounds. Using heavy mp3 ring tones, keypad tones, vibrating and other chimes together are unnecessary. If you want a ring tone, switch off your vibrating mode. If you are using vibration then turn off mp3 ringtones. Turn down the overall volume of your phone as loud mobiles can be annoying and prone to battery wastage. Remember that vibration mode drains out most of your battery power.
Now you want to discharge the battery. If you disable the hibernation setting or anything else that might make the computer go into power saving mode, it would be better. Let the computer run until it shuts down due to loss of battery power, then turn it back on.
So, in summary, if you have a PC which is showing clock errors or BIOS problems look first at the little 3 volt battery. It could save you a fortune. Happy computing!