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Old Dec 29, 2010, 01:27 PM
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East Bethel, MN USA
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FAQ
LiPo cells for UM planes & helis - comparison tests

The question of which LiPo cell is the best for the UM planes & helis comes up often in the ultra-micro forums. Many of us have found that Hyperion cells outperform most of the competition, and that Thunder Power & Intellect UM cells perform as well as, or very close to the Hyperions. Objective tests back up our experiences.

Remember - loaded voltage is what determines the performance of a battery - not usable capacity. Loaded voltage is a function of the cell's internal resistance (Rint). The lower the Rint, the less power will be dissipated within the cell as heat, and the lower the voltage-drop will be under a given load. The cells with the highest voltage under load will provide the most thrust & speed in a given application. Also of importance is the voltage slope over time. The shallower the slope, the more power the cell will deliver over the course of the flight. Also, a shallow slope means that more power will be available toward the end of the flight.

It has been proven many times that Hyperion cells maintain voltage under load better than nearly all of the currently-available LiPo cells. The notable exceptions are the Thunder Power 160 & Intellect 130/160 UM cells - which perform similarly to their Hyperion counterparts. The Hyperions can be charged @ 5c for hundreds of cycles with no reduction in performance or longevity. 300+ 5c charge cycles with no reduction in performance is common. Of course, this assumes than the cells have been properly stored and that they have not been discharged below 80%.

The Intellect & TP cells are also rated for at least a 5c charge. More long-term test data on the TP & Intellect cells is needed to determine how they perform over time; but so far, the reports have been favorable. John & Natterjack have done some excellent UM cell comparison testing.

See John's report here:

http://www.rcgroups.com/forums/showp...0&postcount=22

See Natterjack's report here:

http://www.rcgroups.com/forums/attac...mentid=3170183

http://www.rcgroups.com/forums/showp...8&postcount=64

My favorite sources for Hyperion cells:

RCBabbel: http://www.rcgroups.com/forums/member.php?u=54990

All e RC: http://www.allerc.com/batteries-lith...-c-3_4_93.html

Aircraft World: http://www.aircraft-world.com/shopdi...-Po+-+HYPERION

Hyperion Australia: http://www.hyperionaustralia.com.au/?stg=878

Thunder Power 160 mAh 'UM' cell:

All e RC: http://www.allerc.com/thunder-power-...or-p-5784.html

RCBabbel's plug & play Hyperion 180 mAh 2s packs for the UMX Beast & Sbach: http://www.rcgroups.com/forums/member.php?u=54990

Alert!

In Sept, 2010, Hyperion announced that a bad batch of 160 mAh 'UM' cells made it to the sales channels. Hyperion pulled the bad batch from their shelves and told their vendors to do the same. See the post below:

http://www.rcgroups.com/forums/showp...&postcount=302

Joel
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Last edited by turboparker; Dec 31, 2011 at 01:59 PM. Reason: Changed RCBabbel's 'Babbelbatts' link to his blog page
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Old Feb 26, 2011, 03:10 PM
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Hi Joel,

For soldering bare cells you connect the black wire to the black wire on the hyperion battery right? I plan to use the HK PNP wires(they are black and red ultra micro battery connectors:http://hobbyking.com/hobbyking/store...idProduct=9727), cut the connectors off and solder them to the hyperion 240mah packs. Cheaper cells and lighter cells than the blue shrink wrap ones.

Thanks!
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Old Feb 27, 2011, 01:31 AM
Gopher huntin' stick jockey
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East Bethel, MN USA
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Cheese,

There is no black wire on the bare Hyperions - just a piece of shrink-tube. Look for the + & - markings on the cell. I also like to make my own 'M' cells. As you noted - they're much lighter than the factory shrink-wrapped cells. Also - Glenn has the pigtails, too. He uses high-quality UM connectors on his.

http://www.rc-connectors.com/index.p...roducts_id=188

Joel
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Old Feb 27, 2011, 05:43 PM
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Quote:
Originally Posted by turboparker View Post
Cheese,

There is no black wire on the bare Hyperions - just a piece of shrink-tube. Look for the + & - markings on the cell. I also like to make my own 'M' cells. As you noted - they're much lighter than the factory shrink-wrapped cells. Also - Glenn has the pigtails, too. He uses high-quality UM connectors on his.

http://www.rc-connectors.com/index.p...roducts_id=188

Joel
Which wire is positive(just to be sure)? The ultra micro lipo connectors don't have any markings. I'll consider Glen's connectors.
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Old Feb 27, 2011, 11:40 PM
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Quote:
Originally Posted by Cheese5 View Post
Which wire is positive(just to be sure)? The ultra micro lipo connectors don't have any markings. I'll consider Glen's connectors.
I'm not sure what you mean. The connectors I use come with the red & black wires already attached. Of course, red is positive. If you have raw connectors & wire, you will have to match the connectors up with the plane and/or a stock battery so you can be sure.

Joel
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Old Feb 28, 2011, 08:30 PM
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Quote:
Originally Posted by turboparker View Post
I'm not sure what you mean. The connectors I use come with the red & black wires already attached. Of course, red is positive. If you have raw connectors & wire, you will have to match the connectors up with the plane and/or a stock battery so you can be sure.

Joel
OK, Thanks! I'll do that!
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