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Details about  Maxwell 350 Farad 2.7V Ultracapacitor/Supercapacitor D Cell PCB,Solder Qty 8

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Maxwell 350 Farad 2.7V Ultracapacitor/Supercapacitor D Cell PCB,Solder Qty 8
Item Ended
Item condition:
Brand New
10 May, 2013 11:11:54 AEST
US $65.00
Approximately AU $89.93(including postage)
US $10.00 (approx. AU $13.84) Express Postage | See details
Item location:
Foxboro, Massachusetts, United States


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  10 May, 2013 02:52:43 AEST  View all revisions

Item specifics

Condition: Brand New  

Maxwell 350 Farad 2.7V Ultracapacitor

You are bidding on a lot of 8 new, unused Maxwell BCAP0350 E270 T11 BOOSTCAP 350 farad 2.7 volt ultracapacitors. These are the next generation of energy storage, and will eventually replace batteries in many applications. They are very similar to normal capacitors, except they have enormously more energy storage capacity. They have the following advantages over batteries:
  • Can be charged and discharged far more rapidly than batteries (almost instantaneously in most applications)
  • Not affected by temperature extremes
  • Virtually unlimited life (over one million charge/discharge cycles)
  • No complex charge controller necessary, just be sure the voltage never exceeds the unit's rated voltage of 2.7V
  • Contain no acid or corrosive chemicals

Basic specs:

  • Capacitance 350 farads
  • DC Equivalent Series Resistance (ESR) 3.2 milliohm
  • AC Equivalent Series Resistance (ESR) 1.6 milliohm
  • Short Circuit Current 1687 Amps
  • Max Peak Current (1 sec) 220 Amps
  • Absolute Max Voltage 2.85V
  • Operating Temperature Range -40°C to +65°C
  • Stored energy 1275 joules (.354 WH)
  • Max Power 976 Watts
  • Connections PCB solder pins
  • Weight 2.1 oz (60 grams)
  • Diameter 1.3 inches (33 mm)
  • Length 2.44 inches (62 mm)

You can solder the ucap in a PCB or solder directly to the pins to make connections.
They are basically the same size as an ordinary D cell flashlight battery.
Click HERE to see the Maxwell data on this item.

Click HERE and then click on DOWNLOAD to see a large number of Maxwell references, explanations and application notes.

Click HERE for a short note on converting electrical energy units to mechanical energy units.
One important application for these devices is for electric vehicle regenerative braking. Due to their ability to quickly charge and discharge, they can recover 80% or more of the car's energy that would otherwise be lost in heat. Batteries generally can recover less than 30% of this energy due to their limited charge acceptance.
Another application is the storage of solar energy. Many solar applications (garden lights, for instance) quickly fail due to the poor life expectancy of the battery in repeated charge/discharge cycles, poor charge control, and temperature cycling. Ultracapacitors are largely immune to these problems. These ultracapacitors can be combined in series for more voltage or parallel for more current. They ought to be good for solar related projects such as remote sensor power, solar lighting, solar electric gates, etc
I used a pair of these in series with some small solar panels to solarize the transmitter of a indoor/outdoor thermometer so I would never have to change its batteries. We sell the solar panels HERE I used 3 panels in series with a voltage limiter much like the one in the kit HERE to keep the voltage under 3.5V to keep from damaging the transmitter. One panel might have been enough, but I wanted to mount it in the shade, and I had a nice frame that 3 fit in neatly.
And HERE is a very good website dedicated to ultracaps with a lot of useful info, theory and tips.

And HERE is a good description of how using just three 10 farad capacitors made possible the production of a battery powered tubing cutter, with an explanation of the circuit used.

And HERE you can see an entertaining video of how to destroy nails and coins with ucaps.

Click HERE to see an interesting web page by someone who made a pool lighting system using solar panels and ultracapacitors.

They are also beginning to be used in space satellite applications due to their robust design and superior life expectancy over batteries. And now they are in the new Pugeot cars for stop/start systems. See
for an article on this application.
We just got a good deal on a load of brand new Maxwell ultracapacitors and modules, of which these are just a part. You can check them out along with our solar and EV stuff by clicking HERE.
These ultracaps are unused surplus, first quality items.
For technical questions, email

Buyers pay all duty fees and taxes.

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