How do I manually override the safety features when my battery is below 2 volts?
To manually override safety features for a battery below 2 volts, press and hold the Manual Override button for three seconds. This mode disables spark proofing and reverse polarity protection, so be extremely cautious and ensure you connect it correctly (Page 7).
From the official Noco Gb40 Boost Jumper Lithium Jump Starter manual, page 7
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