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Old 01-07-2017, 08:59 PM   #251 (permalink)
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You'd need current limiting and a boost converter to pull that off though. Dead caps drain current like a short, and an 18650 will likely explode in a couple seconds if connected directly. This is why I used a loose car headlight along with a regular battery charger to get my bank started way back when.

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Old 01-07-2017, 09:50 PM   #252 (permalink)
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I was thinking of using a few of these with usb cables attached to the ends
https://www.aliexpress.com/item/XL60...5-0e9f0b961531


I have several usb powerbanks that i could plug the car in to to start it when needed.

If not i have several other batteries (nimh, lithium, lead acid) that i can strap my imax charger to.
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Old 01-07-2017, 11:21 PM   #253 (permalink)
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If those don't have built in current limiting (didn't see anything at first glance), you might burn them up.
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Old 01-08-2017, 12:08 AM   #254 (permalink)
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IDK about those little ones, but the bigger boost modules I have have both voltage and a current control.
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Old 01-08-2017, 02:39 AM   #255 (permalink)
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Interesting, link?
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Old 01-08-2017, 04:28 AM   #256 (permalink)
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DC-DC 150W Step Up Voltage 10-32V to 12V-60V Boost Constant Current Module | eBay

minimum 10v or so on those, mind you.
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Old 01-08-2017, 05:07 AM   #257 (permalink)
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Something with a minimum of 3 would be ideal. Then one could use straight lithium ions.

No need to balance them am straight cells can be used in parallel.
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Old 01-08-2017, 07:13 AM   #258 (permalink)
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Does anyone here know about ecu tuning?

I know you can fiddle with the ignition timing, fuel pressure, injector timing etc... can you also play around with charging voltage? In these applications, it might be advantageous to pump it up to say 15 or 16V (if you are able to fast balance the capacitors). Or change the algorithm of the charges.
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Old 01-08-2017, 03:10 PM   #259 (permalink)
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I wouldn't want to run everything at a higher voltage than normal.

I believe Mazda has a supercap that is charged up at a higher voltage, and has a regulator that brings the voltage back down to normal when feeding accessories.
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Old 01-08-2017, 05:04 PM   #260 (permalink)
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Right, Mazda i-ELOOP runs at 24V, and supplies the car with 12V via a buck converter.

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