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Old 10-04-2018, 12:03 PM   #1
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Default Rechargeable car jump starter battery replacement.

So, my jump starter decided to die on me. I managed to remove the battery and I'm guessing it is the problem since the device is not holding power any more. When recharged the test button works in the first try for a moment then no charge is indicated in further tests.



It's a 12V 9Ah 100A battery. Should I get the same or something higher? How much higher can I use without harming the car's electrical system? My car uses a 12V 88A battery.
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Old 10-04-2018, 01:01 PM   #2
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Default Re: Rechargeable car jump starter battery replacement.

You wont harm the car by using a higher capacity battery. Obviously you will get a 12 volt battery but you can increase Amperes per Hour (Ah) and the current capacity (A) of the battery your car will only draw what it needs. Your problems will come with the size. Higher capacity batteries tend to be physically bigger so, probably, wont fit in the box. Also whatever you use to charge that battery will have to be able to charge a higher capacity battery. Most chargers though, apart from the very cheap ones, should be able to cope. I have to say that if you need to use a jump starter on a regular basis you have got something wrong with your car electrics unless you are a mechanic and spend a lot of time starting other people's cars.
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Old 10-04-2018, 01:10 PM   #3
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Default Re: Rechargeable car jump starter battery replacement.

Maybe you already know this, but I'll explain just in case.
  • 9Ah means your car can give out a total of 9 Amps (or Coulumbs/s) during an hour. This can also be measured in Coulombs.
  • 12V is an equivalent to your battery's "strength". (Take a look at this to understand it better.)
  • 100A is the maximum current your battery can provide at any given time.
So, if you looked at the link, you'll know that as long as the voltage remains the same, and the resistance desn't change (which it won't, since you are not touching the system), the maximum current will stay the same. You could have a 12V 9999999Ah and 999999999A battery and it wouldn't change a thing, except it'll last longer.
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Old 10-04-2018, 06:49 PM   #4
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Default Re: Rechargeable car jump starter battery replacement.

To be clear, I'm talking about the rechargeable battery inside the jump starter device.


Jump starter like this:



Its battery is like this:



I dissembled the jump starter and removed the battery to replace it.
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Old 10-04-2018, 07:51 PM   #5
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Default Re: Rechargeable car jump starter battery replacement.

Quote:
Originally Posted by Smart_Guy View Post
To be clear, I'm talking about the rechargeable battery inside the jump starter device.


Jump starter like this:



Its battery is like this:



I dissembled the jump starter and removed the battery to replace it.
So ?
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Old 10-05-2018, 01:16 AM   #6
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Default Re: Rechargeable car jump starter battery replacement.

Why don't you just purchase the same size battery as a replacement? There are plenty of places on the internet that sell those batteries.

I have a similar device and replaced the original battery with one I ordered on-line. It was a few years ago but the only issue I had was that the battery terminals were slightly different but still workable.

Here's a link to a vendor in the US with an exact replacement: https://batteryclerk.com/products/aj...m-vrla-battery
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Old 10-05-2018, 08:33 AM   #7
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Default Re: Rechargeable car jump starter battery replacement.

Nice. I was wondering if a higher capacity (or whatever-ity) replacement battery could make a difference in jump starting quality. With the last one I had to leave the jump starter connected to the battery for sometime for the ignitions to start. It felt like The jump starter itself wasn't powerful enough to start the engine but barely enough to charge the batter after sometime for that.


I'll just find similar specs battery then. Thanks.
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Old 10-05-2018, 09:06 AM   #8
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Default Re: Rechargeable car jump starter battery replacement.

They're junk SG. Don't waste your money on them. They do not keep. I had a 1000 amp and a 500 amp that didn't last very long.
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Old 10-05-2018, 12:31 PM   #9
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Default Re: Rechargeable car jump starter battery replacement.

Does that include both rechargeable sealed lead-acid something and lithium something battery based jump starters? I wonder if lithium rechargeable batteries for jump starters are as practical as those in cell phones and laptops.
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Old 10-05-2018, 04:15 PM   #10
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Default Re: Rechargeable car jump starter battery replacement.

If you buy a cheap one then it probably won't last. I have one that is about 10 years old and is still going strong but I have replaced the battery once in that time. Mine cost around $200 so it wasn't exactly cheap. This is the one I have and really like: https://www.amazon.com/Schumacher-PS.../dp/B01LRJ2EQU
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Old 10-05-2018, 05:55 PM   #11
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Default Re: Rechargeable car jump starter battery replacement.

Yeah, that's what it is. What I had were cheap jobs from an auto parts store. The only way to make them last longer is to keep them on a float charger but you can't do that if you carry it around in your car.
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Old 10-05-2018, 07:38 PM   #12
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Default Re: Rechargeable car jump starter battery replacement.

I just read that the lithium ones are much more reliable than these acid ones. I'm guessing those in the link are acid based since they are large. I'm looking at one now; this:

https://no.co/gb40


I'll look more into it. I think I'm gonna get rid of the broken one I have instead of replacing the battery. It's a no brand (that I could find online) make and the culprit could be something other than the just battery.
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Old 10-06-2018, 05:42 PM   #13
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Default Re: Rechargeable car jump starter battery replacement.

That thing claims it can provide 1000 amps of starting current. Hope the vehicle starts in 1-3 seconds like they claim, those wimpy wires couldn't handle 1000 amps for much longer than that without frying!

If it does everything that it claims, it looks like it would be pretty handy to carry in your car and wouldn't take up a lot of space.
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Old 10-06-2018, 05:47 PM   #14
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Default Re: Rechargeable car jump starter battery replacement.

1000 amps seems ridiculous. However, like I already said, that's just a maximum value.
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Old 10-06-2018, 06:52 PM   #15
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Default Re: Rechargeable car jump starter battery replacement.

The 1000 amp one I had has thick cables just like good jumper cables. Carrying them around is like carrying an extra car battery. They'll lose charge from sitting. If too long they'll sulfate.
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Old 10-07-2018, 11:38 AM   #16
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Default Re: Rechargeable car jump starter battery replacement.

Yeah, maybe that's the peak amperage to give the kick to the battery for little moments. They do tell to remove the cables once engine starts. I wonder if it's good for my car in the first place. The engine is old and I heard older engine need more aggressive amperage.


You know what, I'll see if a battery shop can open the dead battery and fix it. It's still an acid battery after all.
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Old 10-07-2018, 11:50 AM   #17
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Default Re: Rechargeable car jump starter battery replacement.

It's not an old engine that needs an extra boost. It's the old starter. Also the old engine will turn easier than a new engine so the new engine needs the extra boost.
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Old 10-07-2018, 11:53 AM   #18
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Default Re: Rechargeable car jump starter battery replacement.

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Also the old engine will turn easier than a new engine so the new engine needs the extra boost.
Really? I didn't know that.
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Old 10-07-2018, 12:16 PM   #19
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Default Re: Rechargeable car jump starter battery replacement.

I kinda feel better.
I do have a problem starting the engine on warm starts tho, but that's case specific.
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Old 10-07-2018, 01:21 PM   #20
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Default Re: Rechargeable car jump starter battery replacement.

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Really? I didn't know that.
With a new engine, things are tighter because they haven't been "broken in" yet. The piston rings need to wear a little to get seated well and such. That's why you need to take it easy the first few hundred miles with a new car.
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