Samsung Galaxy Note 10.1 — need advice on battery for N7000

my friend's n7000 need to recharge everynight n i think he is also a heavy user, but your phone drained even faster...just got a mpj extd battery for my note 3. I'm sitting at 8 hours and 90% present so it is well worth it for me.

Yes, definitely replace the battery. After the amount of time the Note has been in service (2 years) it's entirely likely that the original battery is on the way out (although it is disappointing, as Li-Ion batteries can last for up to 3 years, although performance degrades over time and charge cycles). The problem is, as the battery degrades and you need to charge more, the battery degrades even further due to the higher charge count. And the more you discharge them each time the worse it gets. Li-Ion has no ''battery memory'' so you're better off charging them every time you have the chance (but never overcharge as they are prone to thermal runaway, meaning if you overcharge them they can leak, warp or explode). So the trick to prolonging Li-Ion battery life is partial discharges and regular micro-charges (but not overnight - I leave my phone on low-power overnight (as I don't want beeps all throughout the night anyway!) and then charge it while I get ready for work in the morning and then charge again at my desk perhaps twice a day). I'd recommend doing a good bit of research into the extended battery you think about buying first and make sure you buy from a well respected manufacturer. It's not worth saving $10 if if costs you your Note!