Remote battery holders and batteries that are fresh from the store in an 8-pack or less (usually have a date about 5 years in the future on them). I have also found that bulk batteries such as what Costco sells can be less reliable than the smaller packs.
If you had four batteries in your game that were different, this is likely why they leaked. Never mix and match batteries and always try to use batteries of the same vintage.
NVRAM. Just get batteries out of the equation all together. There is no need to have the risk of leaks in a pinball machine. There is an appropriate NVRAM solution for every generation game that uses batteries. It is always worth it.
Quoted from Shenanigander:batteries out of a wii fit board
Quoted from Shenanigander:Glad I didn't use these in any pinball machines.
Quoted from DaveH:NVRAM. Just get batteries out of the equation all together. There is no need to have the risk of leaks in a pinball machine. There is an appropriate NVRAM solution for every generation game that uses batteries. It is always worth it.
This^^^^^
Those look the same as the energizer press to test type. The energizers i had did the same thing which I feel is a bad design. I had all three same brand with date no where near the expiration date. One leaked violent just like your picture.
NV ram or lithium are the ticket now.
Don't use alkaline batteries *at all*. There is no need to today, and they are ticking timebombs anyway.
Lithium if you have to (but they are not leak-proof), and NVRAM is best (nothing will leak).
Industrial heavy duty chemical dry batteries if you must use them.
You cannot but them at Walmart, and they cost 2.5× more.
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