NOCO
Boost Plus GB40
$99.95
Released 2023
Best Car Jump Starters · head-to-head
Boost Plus GB40 vs SL1639 Lithium Jump Starter
A sourced, side-by-side comparison. SL1639 Lithium Jump Starter is cheaper at $75.51. Every spec and price links to its source.
Schumacher
SL1639 Lithium Jump Starter
$75.51Cheaper
Released 2022
Which is better: the Boost Plus GB40 or SL1639 Lithium Jump Starter?
The SL1639 Lithium Jump Starter wins 1 of the 1 specs we compare head to head; the other wins 0. The SL1639 Lithium Jump Starter is the cheaper at $75.51. The SL1639 Lithium Jump Starter both leads on specs and costs less — the straightforward pick.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Boost Plus GB40 | SL1639 Lithium Jump Starter |
|---|---|---|
| US price | $99.95 | $75.51 |
| Brand | NOCO | Schumacher |
| Released | 2023 | 2022 |
| Msrp usd | 124.95 | — |
| Peak amps | 1000 | 1000 |
| Battery capacity (mAh) | 2150 | — |
| Max gas engine liters | 6 | 8 |
| Max diesel engine liters | 3 | 6 |
| Jump starts per charge | 20 | 30 |
| USB c output watts | — | — |
| Has air compressor | No | No |
| LED lumens | 100 | — |
| IP rating | IP65 | — |
| Weight (lb) | 2.45 | 1.6 |
| Warranty years | 1 | 1 |
Sources — Boost Plus GB40: no.co (verified 2026-06-23). SL1639 Lithium Jump Starter: schumacherelectric.com (verified 2026-06-23).
What's the difference between the Boost Plus GB40 and SL1639 Lithium Jump Starter?
Where the two actually differ on the specs we track (4 of 12). Matching specs are omitted.
- Max gas engine liters: Boost Plus GB40 6 vs SL1639 Lithium Jump Starter 8
- Max diesel engine liters: Boost Plus GB40 3 vs SL1639 Lithium Jump Starter 6
- Jump starts per charge: Boost Plus GB40 20 vs SL1639 Lithium Jump Starter 30
- Weight (lb): Boost Plus GB40 2.45 vs SL1639 Lithium Jump Starter 1.6