NOCO Boost GB40 vs GBX45: Which 12V Jump Starter?
By CEN | Published: 2026-10-30
Category: Comparisons
Compare the NOCO Boost GB40 (1000A) and GBX45 (1250A) to find the right 12V jump starter for your vehicle. Key differences in power, engine compatibility, and value.
Quick answer
For most cars and light trucks, the NOCO Boost GB40 offers reliable 1000A power at a lower price. Choose the GBX45 if you need extra cranking amps for larger engines or want the latest PX Lithium technology.
Power and engine compatibility
The GB40 delivers 1000A and handles petrol engines up to 6.0L and diesel engines up to 3.0L. The GBX45 steps up to 1250A, supporting petrol engines up to 6.5L and diesel up to 4.0L. If you drive a standard sedan or small SUV, the GB40 is plenty. For a large V8, boat, or RV, the extra headroom of the GBX45 provides more confidence.
Technology and charging speed
The GBX45 introduces NOCO's PX Lithium Technology, which enables faster recharging and higher peak output in a similar-sized package. The GB40 uses proven lithium-ion cells that are still very capable but charge more slowly. If you need to recharge the jump starter quickly between uses, the GBX45 is the better pick.
Price and value
The GB40 is priced at USD 74.77 (compared to USD 109.95), making it a strong value for everyday drivers. The GBX45 costs USD 83.67 (compared to USD 134.95), offering a modest price increase for 250 extra amps and newer technology. Both are well under their comparison prices, so you get genuine savings regardless of choice.
Trade-offs at a glance
- Power vs price: GB40 offers 1000A at a lower cost; GBX45 gives 1250A for a moderate premium. Choose GB40 to save money if your engine fits within its limits.
- Charging speed: GBX45 recharges faster thanks to PX Lithium Technology; GB40 uses standard lithium-ion. Pick GBX45 if you need quick turnaround between jump starts.
- Engine size compatibility: GB40 handles up to 6.0L petrol / 3.0L diesel; GBX45 extends to 6.5L petrol / 4.0L diesel. Match the unit to your largest vehicle's engine displacement for reliable starts.
Product facts
- NOCO Boost GB40 1000A UltraSafe Jump Starter Power Pack 12V Car Battery Booster: Rated at 1000A, supports petrol engines up to 6.0L and diesel up to 3.0L. Provides up to 20 jump starts per charge. Covers most passenger cars and light trucks without overspending on unused capacity.
NOCO Boost GB40 1000A UltraSafe Jump Starter Power Pack 12V Car Battery Booster - NOCO Boost X GBX45 1250A UltraSafe Jump Starter Power Pack 12V Battery Booster: Rated at 1250A, supports petrol engines up to 6.5L and diesel up to 4.0L. Features PX Lithium Technology for faster charging. Delivers extra power and quicker recharging for larger engines or frequent use.
NOCO Boost X GBX45 1250A UltraSafe Jump Starter Power Pack 12V Battery Booster
Which one fits you?
Best for
- Budget-conscious drivers of standard cars and small SUVs – the GB40 provides ample power at a lower price.
- Owners of larger vehicles (boats, RVs, trucks) or those wanting the latest tech – the GBX45 offers extra capacity and faster charging.
Not for
- Heavy-duty commercial fleets or extreme cold-weather use where a higher-amp unit (e.g., 2000A+) might be needed.
