Please Advise On The Best Way To Keep Your Battery Healthy And Not Deformed

I am a black macbook (mb) user and have had my mb for 37 months now. after a year and a half, my battery (the first one) was deformed and i was advised to replace it quickly. i was also advised to calibrate my battery occasionally and so i did after that. but in just over a year after i replaced my battery, it is starting to deform and swollen. i have been following the advice and calibrated my battery as advised. my battery is still in normal condition according to the system profiler.
when i first bought my macbook, i was told NOT TO keep recharging my battery whenever i used it and the battery drains because this would make the battery's life shorter. i was also told it is OKAY to have the power plugged in. and so i did that. but it turned out that my battery had deformed from it. most probably from the heat but i don't know.
i use my macbook regularly. i keep it switched on almost 24 hours a day and i keep it well ventilated (i sit it on top of iLap) because i have my internet on 24 hours a day and use the internet regularly. i am not planning to replace my battery just yet even though the battery capacity has gone down to 77%. it's expensive here. i will keep on continuing with the calibrating every now and then. now it might be the magsafe's problem that the battery is deforming too soon. one time, the magsafe fell from my bed onto the floor quite hard. and since then it wasn't working properly. sometimes it heats up and it becomes too hot to hold for long. at times the battery would say 0:00 (time left charging) but the light doesn't change to green so i have to plug it out from my mb and from the main plug and rest it for about 10 seconds and then it runs as normal. i know i probably need to change the adapter soon.
anyway, i'm just asking. for someone who uses his mb regularly or everyday and almost 24 hours a day, what is your best advice on how to keep the battery healthy and in good condition for a long period of time?
sorry for the rambling but thank you.

About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

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