Two years later, my lead-acid battery is about to be 5 years old. I'm pulling the trigger on a Christmas present for myself. Bioenno Power 12V, 500 CCA, 20-30 Ah "lead acid equivalent." 4.4 pound weight. The website says it can handle a brief spike to 625 CCA. I'll put a supercapacitor in parallel, if I have to...
https://www.bioennopower.com/collections/480-to-500-cca
With the BLACKFRIDAY promo code, it's 15% off, so my total cost will be $216. That's about the same as a high-end lead-acid battery, anyway. I'm very excited.
I'm currently googling whether I can charge this battery up with a power supply or if I should spend the extra $15 for a charger. I guess I can charge it with a power supply.