Best solution for the battery in a mvs?

Hey guys! One of the first things I did when got my mvs was to rip out the leak-prone battery. Now, I'm thinking about my options of replacing it and I think I've got the following options to choose from:

1) another rechargeable watch battery - these require the machine to be turned on frequently so the battery doesn't go flat. Might possibly be subject to the same leaking issues the originals had. Has the advantage of being able to keep saves alive so long as it's being topped up.

2) a non-rechargeable watch battery - these will hold a charge far longer than the rechargeables and don't need charging but when they die there's no way to save your saves.

3) a super capacitor- similar advantages and disadvantages as the rechargable battery minus the leaking threat and possibly able to hold a charge for longer than the rechargable watch battery.

What do you think is the best option?

 

Some supercaps can leak too, a well-known example is the small RTC backup supercap in the Xbox 1. Unfortunately I have no idea how much current the backup RAM and RTC of the Neogeo need while it's powered off, but it is possible that a supercap solution may only be good for a few days to weeks.

On my two MVSes, I replaced the battery with a CR2032 holder and disabled the charging circuit. The battery should be good for at least a few years and I'm not that worried about the backup data anyway.

 

How about
4) Install two battery holders (in parallel) so you can replace cells without losing saves. Also doubles the time between replacements.

 

I would say ML2032 + battery holder should be enought? You can change them easily, don't have to disabling charging circuit and it souldn't leaking for at least 10/15 or so.
I was planning to do so on mines.

 

ML2032 + battery holder is what I do too.

 

I was just thinking that! Having two batteries running at the same time isn't bad for it?

About how long does it generally take for one of these batteries to go flat?