Yeah I think it's breathable type so maybe no need to worry

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Lillee - 1969 Morris Mini K

I do what Ian McNeil does. Direct connection to the battery, with a small two pin plug to join to the lead from the wall mounted trickle charger. Do it on all my cars and did it on the motorbike. Left them plugged in for weeks at a time, no issues.

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For safety there are batteries that you can buy mainly the N55 etc squat type ones used on European cars which have a Vent tube coming out of one end at the top which you just feed through a hole down to under the car. Any fumes that battery makes are expelled to outside the car. Battery fumes cause a lot of corrosion. It is safe to charge a battery which is enclosed in the boot but just do not connect or disconnect the leads while the Charger is switched on.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

Is this even the case for a sealed gel type battery??? Do they even leak anything if the battery is entirely sealed? (I have a Optima Yellow top gel type battery)

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Lillee - 1969 Morris Mini K

and that's when Baking Soda and boiling hot water comes in handy

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"Show me the Mini!"

Why not just remove the battery from the boot? Rules out any risk. Only take a minute to refit the battery.

A minute?? no way... at least 5 mins. Boot board out, spare out, jack out, loosen battery tie down nuts, undo 2 terminals, lift battery out. Then all over again when you want to drive her?

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Lillee - 1969 Morris Mini K

... then go and book an appointment to have your lower back fixed after leaning across inside the boot with a heavy battery in hand.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Batteries in Mini's aren't that heavy... lol

Brad

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During the day I work on English designed cars & on my own time I work on English designed cars....

After 30 years of swinging babies (and small children) around on my hip, my back isn't perfect, so leaning over the damn boot lid and trying to gently place a battery into its position can be a bit problematical.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

I know how problematic that can be. It's the low height bit that makes it challenging for me, although it's a lot easier changing a Mini battery, than a 25kg+ battery in the cabin of a $500,000+ car.

Brad

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During the day I work on English designed cars & on my own time I work on English designed cars....

I dunno Brad, I have a 780CCA Deep Cycle Optima Yellow top and it's pretty heavy!!

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Lillee - 1969 Morris Mini K