WTB: Jaycar 300A Power Bank

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Forums › Offers and Wanted › WTB: Jaycar 300A Power Bank

Speedy885

182 posts

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#271677 22-May-2020 00:01

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.

neb

11294 posts

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#2489049 22-May-2020 00:30

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.

neb

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#2489050 22-May-2020 00:38

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.

SomeoneSomewhere

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#2489051 22-May-2020 00:48

Power tool batteries are still chosen for good cycle life, safety, and a reasonable capacity. Throw those away and you get RC batteries.