After a good long slow charge they worked great as planned for my stereo. May require a few for the next project. Thanks

Note the cap on the left side in the middle. All the magic smoke came out. Stinks in here.Unfortunately I waited too long to test it and now I can't return it.Charging current was 14v 1a. Would have hated to see what happened if I let have the full 10 amps the supply could give it.

Bought this for replacing a battery in a 50cc scooter. Not sure what the usual application is, and there are no directions that came with it, but the first couple days tests show it to work. May review again after long term tests.I've seen several videos of supercapacitors replacing automotive batteries. The basic idea is to have enough current to start the vehicle (for normal operation: Won't have enough for multiple attempts if the vehicle isn't running well enough to start on the first go) and let the charging system handle the loads.Considered this because small batteries for scooters are VERY expensive for their size. Also, since the vehicle sits during bad weather, batteries that are not maintained will sulfate and become useless over time. My particular scooter doesn't help (cheap Chinese scooter), as the charging system has run high, which cooks the electrolyte out of the battery and damages it.I installed this SuperCap and hooked the battery cables up to the OUTER slots (Oval shaped, not the central round terminals). It is probably advisable to charge up the capacitor bank before starting, though since the scooter has a kick-start and a permanent magnet alternator, it will start when fully depleted. As such, the lights and turn signals will act strange for a couple of miles while the Supercap charges up to full operating voltage. In the future I will endeavor to pre-charge so as not to strain my electricals. Since it's solid state and not a battery, I no longer worry about shortened battery life.IMPORTANT NOTE: I have run this for only 3 days so far. Initial testing shows it does hold a charge overnight, enough so to start in the morning. The charging system appears to be running in a normal range. I will monitor and update a few months down the road for any long term issues.Update: 1 Month on. Working fine. I have a voltmeter USB charger plugged into a 12 volt auto socket that I wired into the scooter. It shows the system working in a normal range. A couple of times I forgot to disconnect the voltmeter and it ran the power out over a few hours and I had to kick-start, but it charged right back up. Tinkering shows the Supercap has enough power to charge a phone for 4 or 5 minutes after the scooter is shut down, but it will require a kick-start after that. So far, the Supercap has held a start-capable charge for 2 days. Haven't yet let it sit longer. Will update after winter.2nd Update: 7 Months. Still works fine. It will self-discharge after a week, enough that you are unable to start the scooter. If you run a cheap Chinese GY6 scooter, kick-start may not always be a good way to plan on using this (GY6's are "high maintenance". Mine is hard to kick start, but button-start is perfect). I doubt a modern battery charger will work on these, as most processor-controlled chargers probably don't "read" it as a battery, and will likely error out rather than charge. I have an old Jump-Start-pack battery I use to pre-charge it when it's down. When these 'caps are down to zero, they WILL melt small gage wires used to pre-charge: Supercaps can empty and fill FAST, so amperage draw when it is empty is something to consider. Use 10 or 8 Ga. wire if you use a car battery to pre-charge, and pulse it on/off 2 to 5 seconds at a time until the voltage reaches 10, then leave it connected to finish "filling up". Other than these tips, I see no problem with them. I do plan to build a water-tight box for them to reside in, one that fits in the battery well enough that it won't bounce around and damage itself.2nd to Final update: 7-25-24 Still working fine. Overall, it holds enough power to charge a phone for 5 minutes, or 3 or 4 average attempts to start my scooter, before winding down beyond start-up usage. If your bike is reliable starting, it works well with none of the usual battery issues. Having bought 3 of these now I gave one to a friend with a 3D Printer to make the dry box for it. Will probably link to him later (if allowed) if you are interested in the box.