In freezing weather it is peak current that counts, not so much capacity. Lokithor's J401 and J402 PRO reach 2,500-3,500 amperes, while the Blitzwolf BW-JA1 (16,000 and 20,000 mAh) and the Forever JS-400 are at the more compact end. Many models also have a power bank function, a torch or a compressor, so the same bag takes care of tyre pressure as well. The J401X is rated to work even at -40 degrees.
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In freezing weather it is peak current that counts, not so much capacity. Lokithor's J401 and J402 PRO reach 2,500-3,500 amperes, while the Blitzwolf BW-JA1 (16,000 and 20,000 mAh) and the Forever JS-400 are at the more compact end. Many models also have a power bank function, a torch or a compressor, so the same bag takes care of tyre pressure as well. The J401X is rated to work even at -40 degrees.