As you know and may never ever forget, Billyboya bought a cheap AliExpress battery from the official Littokala store which claimed 30A (?) continuous discharge capability for his eRider moped...
https://www.pedelecs.co.uk/forum/threads/bad-battery-from-aliexpress-com.43913/
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I'm wondering whether two of these cheapo 36V 20Ah in parallel...
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
...would operate safely and for longer than a few mere months @7.5A continuous discharge X 2 = 15A. The "20Ah" capacity stated is probably nonsense, but if about 15Ah each, that'd still be pretty cheap for 30Ah in total. I might try cheapos once I've assembled (I've got all the bits [there will be a diagram and photos etc. when I get around to it]) my Early-Warning-Of-Home-Ruination-by-Ebike-Battery-Fire-Preventerer™ ®
© : Hear siren, chuck the soon to be flaming battery out of the window. Unsure what I'd do if they went inferno while on the bike though, other than run and record my bike burning from a safe distance for Youtube.