Quoted from Bugsy:
I am in agreeance with both of these statements. I used to have remote battery packs on my games but became too much of a hassle to write down when the batteries were changed, throwing away dead batteries, buying new ones, checking voltage to see if only one battery is bad, etc.
Although I will say that some board work can be intimidating to some people, which is totally fine. And if that's the case, remote battery packs are a totally viable option and way better than leaving the batteries on the board. If you ever sell you game, the next owner will be very pleased to know you at least did something to take the batteries off the board.
Guys I have no idea why people are still talking about remote battery packs. Put in Lithium AA batteries last very very long and can NEVER leak. NVRAM only other opinion. Leave them on the board get rid of the pack.