![]() – As well, most have a ‘peak’ amp rating, and a regular amp rating which is significantly lower. For example, Tacklife has a line out, and they advertise numbers like 600A or 800A, and say it will start 7.0L vehicle. I’ve been looking for info on the different amp ratings they give, along with the displacement numbers. ![]() You could take it home and charge it afterwards. It’s only 8kg and has a maximum continuous discharge of 85A for 40 minutes. I’m guessing weight’s an issue on your boat, so it’s probably not an option.ĭepending on your budget, I’d probably choose a Lithium battery like this one instead. But that would be way more expensive than a dedicated battery and possibly heavier. The other option could be to get one of those huge jump starter packs designed to start large truck diesel engines. I love your idea, but you would only get power for a short time (10 or 20 seconds at most) before the jump starter shut down to protect its internal battery. If you’re trying to start a car, the jump starter internal battery needs time between starts to recover. The current drops off very quickly after the initial burst of power. Portable jump starters are designed to output maximum current for a very short time… just long enough to start a vehicle. Related questions – How do you determine which portable battery jump starter to get for your car for emergencies? – Which Noco Genius do I need? Just double-check the battery’s CCA rating against the jump starter’s amperage rating first (1,000A for the GB40). In this case, a jump starter rated at higher than 540A will be okay. Confusingly, the jump starter will be rated in Amps. This way, you can be sure it will start your car. Once you’ve decided what CCA rating you need, choose a battery jump starter with a higher rating. Also consider whether you might want something bigger than you need, in case you buy a larger vehicle in the future. The CCA increases as the engine size increases, and diesel engines need a larger CCA rating than a petrol engine for the same engine size. If not, have a look in the Electrical Specifications section of the vehicle’s Owners Manual or call your vehicle dealer or a battery sales outlet. The CCA rating of a car battery should be on the battery’s label. It will have “CCA xxx” somewhere on the battery’s label (xxx will be a number). The best way is to look at the top of your battery and find the Cold Cranking Amps rating, or CCA. ☞ What size portable jump starter do I need? ✔︎ Has a manual override feature which allows you to start batteries below 2 volts. ✔︎ Has the ability to charge devices like phones from a USB outlet. For example, if you’re broken down in a dangerous position at night, you can use this to warn other traffic. ![]() A flashing strobe function is also useful in an emergency. This is priceless when you’re caught with a flat battery at night. Being rechargeable from mains power is also useful, but not necessary if it’s rechargeable from USB ports. This means if you connect the clamps to the wrong terminals, the jump starter will show a fault light and will not operate. This is important, as lead-acid batteries (used in most vehicles) can give off explosive gases. Generally, the more you pay the higher the quality. The best battery jump starter is one that’s large enough to start your car! ☺️ See below for more details on how to size a jump starter. ![]() ☞ What’s the best car battery jump starter? ![]()
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