NOCO Boost Plus GB40 1000A UltraSafe Car Jump Starter for 12V EV Auxiliary Battery: Complete EV Owner's Guide

Every electric vehicle has a 12V auxiliary battery that powers door locks, computers, and lights — completely separate from the main drive battery. When it dies, your EV won’t open, start, or respond to the app. The NOCO Boost Plus GB40 is the most trusted compact jump starter for reviving a dead 12V auxiliary battery without risk to your EV’s sensitive electronics.

1000 Amp Peak Current — EV Safe

Delivers 1000A of peak current — enough to jump virtually any 12V automotive battery including the aux batteries in Tesla, Ford, GM, Rivian, and all other major EVs. The spark-proof, reverse polarity protection circuitry prevents damage to EV electronics that standard jumper cables can cause.

UltraSafe Technology

NOCO’s proprietary connection protection detects incorrectly connected cables before any current flows. Safe for inexperienced users and critical for protecting the sensitive battery management systems in modern EVs.

Multi-Function Portable Power

• 12V jump starter (up to 6L gas or 3L diesel engine — and any EV 12V aux battery)
• USB power bank for charging phones, tablets, and devices
• Built-in 100-lumen LED flashlight with emergency strobe and SOS mode
• Maintains charge for up to 1 year in storage

Why Every EV Owner Needs This

EV 12V batteries are often smaller than traditional automotive batteries and more prone to deep discharge if the car sits unused for extended periods. Unlike the main traction pack, they are not kept topped up by the BMS when the car is off. Keep this in your frunk — it has saved thousands of EV owners from an embarrassing tow.