I want to put a back-up battery on an Arduino project and I'm wondering if I really need a Minty Boost.
The pros of the Minty Boost would be, A) it will last longer, B) it won't get drawn on at all until DC goes out, C) it looks good!
The cons are that it costs me $20 instead of $1.50 with the 9V battery...
And just to make sure I understand, if I use a 9V battery in parallel with a 9V DC supply, will the battery not get drawn on (or very little) until the DC goes out? I think that this may do the trick since all I want is ~10 mins of survival after DC goes out.