Garmin Varia eRTL615: The Must-Have Rearview Radar Taillight for Safer eBike Rides

The Varia eRTL615 occupies a specific and narrow niche: it's a radar taillight engineered exclusively for eBikes with a powered accessory port, pulling current directly from the bike's battery rather than carrying its own cells. That distinction matters enormously. Most radar taillights — the RTL515, the RTL615, the Magene L508 — live and die by their internal 500–750mAh batteries. The eRTL615 sidesteps that constraint entirely by drawing from the eBike's power system, which means no charge anxiety on multi-hour rides and no mid-ride power management. At $549.99, it sits well above the standard RTL615 ($149.99) and targets riders who already own a compatible eBike with a 6–12V accessory output. …More info