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Speedy885

182 posts

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#271677 22-May-2020 00:01
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Hi!

 

 

Do you or someone you know own one of these?

 

 

https://www.jaycar.co.nz/300a-lithium-jump-starter-power-bank-li-ion/p/MB3754

 

 

 

 

If its in mint/excellent cosmetic condition (ie no scratches or other markings) I would be very keen to buy it.

 

Price im willing to pay will reflect the condition of your item. Please don't suggest I just buy another brand or something different as this needs to replace an identical one who's outer casing was unfortunately broken.

 

 

Thanks.

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neb

neb
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  #2489049 22-May-2020 00:30
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Not a reply unfortunately, but... three hundred amps? The best, meaning highest-current cells designed for use in power tools, are rated at 10-15C, so maybe 20-40A. There's no way this can deliver 300A, particularly if it's going through an inverter to get it up to 12V.

 
 
 

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neb

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  #2489050 22-May-2020 00:38
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Big Clive has a teardown of a very similar device, looks like they take 12V directly off the LiIon cells, so the charger is a boost/buck converter from 5V and the native voltage is 12V. Still can't see how they could get 300A out of the cells without a vent with flame event.

 

 

Edited to add: So he got 160A with the battery pack blown up like a balloon within seconds, surprisingly no pyrotechnics.

  #2489051 22-May-2020 00:48
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Power tool batteries are still chosen for good cycle life, safety, and a reasonable capacity. Throw those away and you get RC batteries.


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