Antigravity Batteries Micro-Start XP-20 Jump Starter

The Antigravity Micro-Start XP-20 is a 20,000 mAh / 74 Wh lithium polymer jump starter rated for gas engines up to 10.0L and diesel up to 8.0L. The Amazon spec table lists "Specification Met: UL" — the certification is treated as provisional, as UL Product iQ database confirmation was not completed. The labeled 2,000A peak claim has not been independently bench-tested; community evidence confirms starting completely dead batteries on passenger cars, a 5.2L V8 truck from a dome-light-drained state, and diesel semi trucks in real-world field use. Ports include USB-C PD 100W in/out, dual USB-A, a 15V DC output, and a 240-lumen LED flashlight with strobe and SOS modes. A digital display shows battery percentage and watt I/O. Charge retention data specific to the XP-20 is limited; standard Li-ion behavior suggests a top-off every 3–6 months for trunk storage.

Best for drivers covering a range of vehicles — motorcycles to trucks, diesel equipment, and boats — who want a compact unit with USB-C PD charging built in. The 100W USB-C port doubles as a power bank for laptops and tablets, giving this unit real utility beyond emergency starts. Skip it if third-party certification is a hard requirement — the UL listing is claimed on Amazon but not confirmed via UL Product iQ. Step up to a NOCO GB-series unit if a database-confirmed UL listing is a decision factor.

Amazon's spec table claims UL certification; the listing has not been independently confirmed in the UL Product iQ database. Standard lithium polymer (LiPo) battery with a confirmed battery management system; no documented thermal runaway incidents for this model and no active CPSC recall as of 2026-05-25. California Prop 65 warning applies — standard for lithium battery products sold in California. Li-ion batteries are recyclable via Call2Recycle drop-off locations.