Can I use a 45 Magsafe charger for a Early 2011 i7 MBP regularly?

Hello,
A few weeks ago the 60w charger that came with my MBP started to fail and ended up shutting the mac down unexpectedly and preventing it to boot. Therefore, I had to take it to a tech to reinstall OS with all the inconveniences this caused me. Now the computer is fine.
A friend of mine lent me a spare charger he had and told me to use it, seems pretty new and fine, but I just got home and realized it is not 60w as the default MBP but 45 Magsafe charger.
I have been reading Q&As along the forum and I found different opinions, some say yes I can some strongly oppose to it.
I am planning to use it regularly for an average of 5-6 hours of daily basic use ( internet, browsing and downloading music ) can I be safe keeping it for a few months?
Thanks for your help in advance

The general rule is that a lesser charger than was intended for the computer will charge the battery (more slowly) or run the computer, but not both at the same time. While doing heavy tasks, it will be possible that the battery will drain somewhat even while the computer is on A/C power. Shouldn't be a major problem but you should try to get a proper charger to avoid any potential issues.

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