5 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
2 of these reports describe a fire, explosion or shock risk.
Costly or dangerous
GLW battery packs in Hovertrax 2.0 overheat; 20+ reports of smoke or fire (2021 CPSC recall)
Safety risk
Official CPSC recall 21-189, about 237,300 units sold Sep 2016-2018 for about $460.
What to check. If your Hovertrax 2.0 was built between September 2016 and August 2017 and its battery pack has 'GLW' printed on it (serial starting GLW), stop using it and request the free replacement battery pack from Razor.
Hovertrax lithium-ion battery pack can overheat, smoke, catch fire or explode (2016 CPSC recall)
Safety risk
Official CPSC recall 16-215, about 28,000 units sold Dec 2015-May 2016 for $600-$700.
What to check. If you own a Hovertrax with serial number starting 55X120-01, 55X120-02, 55X110-01, 55X110-02 or 55X230-01, stop using it and contact Razor for a free UL 2272-certified replacement.
Hovertrax 2.0 faulty battery shows as yellow battery-level light and fails to power on
iFixit's troubleshooting wiki for the Hovertrax 2.0 describes how to diagnose a faulty battery (yellow level light) and notes a faulty battery can also cause delayed wheel response.
What to check. If the battery-level light stays yellow after a full charge, the battery is likely faulty and should be replaced rather than ridden.
Owner reports Hovertrax battery dies in ~15-20 min despite 45 min stated life
A verified Amazon owner review of the Razor Sonic Glow Hovertrax (a Hovertrax-series variant) reports the battery died in roughly 15-20 minutes against a stated 45-minute life, and the charger indicator light failed to show full charge.
What to check. Expect real-world battery life well below the stated figure on this series; verify battery behavior early in the return window.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Hoverboards & Self-Balancing Scooters catalog, version 0.1.1, under the CC-BY-SA-4.0 license.