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Home✈️Aircraft🚁Helicoptere-Electric General Discussion › Li-pol vs Li-ion....
02-17-2004 06:58 PM  16 years ago
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Fredrik R

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Habo, Sweden

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Li-pol vs Li-ion....
What is the difference between those 2 battery?
Duralite uses Li-ion right? How does Li-pol works as RX pack?

Fredrik
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02-18-2004 12:15 AM  16 years ago
Cassini

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Enterprise, AL

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Both are the same chemically.

Think of Li-Ion as a rolled up or folded up cell and think of Li-Poly as just the cell in a flat package. The Li-Ion due to it being rolled up or folded up will not disepate heat very well. The Li-Poly with disipate the heat alot better due to the construction.

The Li-Ion cells are only good for about up to 3C (3 times the capacity of the pack) in discharge. Example: 1000Mah pack only good for 3000 milliamps or 3 amps)

The Li-Poly cells are good from 3C on up to 20C according to who produces them and what size pack they are. Example: a 340Mah Kokam cell is rated at 20C thus it can be pushed to about a 6800 milliamp or 6.8Amp discharge rate.

Both will work fine as a receiver battery but for using as a battery pack to run an electric motor (for a heli or airplane motor) the Li-Poly is the way to go.

Also, you would need a 2 cell pack for a receiver pack and a voltage regulator is MANDATORY as they are 3.7 volts per cell nominal and would be 7.4 volts total comming from the pack (much higher off a fresh charge).
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02-18-2004 12:58 AM  16 years ago
rscamp

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They are basicly the same and use the same chemistry but the electrolyte is polymerized in the "LiPo" cell. The LiPo doesn't require a hard "case" to contain the electrolyte.

Rob
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02-18-2004 05:22 AM  16 years ago
Fredrik R

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Ok, thanks for the explanation!
How does they respond to cold? Like it is now outside my window, -3 degrees.
Have heard that Li-pol loosing lot or power in cold environment. Is it the same with Li-ion?

Fredrik
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02-18-2004 12:51 PM  16 years ago
Cassini

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Cold effects all batteries (slows down the chemical reaction) but cold really affects Lithium Ion/Polimer batteries more than others.

Remedy: Keep the cells in a shirt pocket under you coat when not in use. When you are ready to fly then take them out and put them in and fly.

Not much of a remedy but that is all there is.
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02-18-2004 03:21 PM  16 years ago
Fredrik R

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Thanks for the answers! Got the info I need
Fredrik
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02-21-2004 12:43 AM  16 years ago
markfsanderson

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Houston, Republic of Texas; USA

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Charging a lithium battery . . .
Do the charge 'the same' - that is do you have to have a charger specific for lithium poly or ion?

Mark F. Sanderson
Mark F. Sanderson
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02-21-2004 02:53 PM  16 years ago
Cassini

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They charge the same meaning a charger good for Lithium Ion is also good for Lithium Polymer. You cannot use a charger good for Nicd or NiMh only for charging them.


Be aware that some chargers out on the market charge to the safe side (Hobico field charger Mk II and the Triton I believe) and do not fully charge the packs - only about 90% which equates out to about 30 seconds of run time on a electric motor. Others charge incorrectly trying to peak out a Lithion Ion/Poly pack as if they were a NiCd or NiMh pack whick can be very dangerous.

Always monitor your charging in person. Don't ever plug them in and walk away.

Charge the pack in a fire safe container as in a Pyrex dish, ceramic pot, etc. If the pack goes, it can shoot particiles up to 20-25 foot away.

If you ever crash a ship with either type cell, don't ever just throw the aircraft into the vehicle you rode in. Let them sit out for about 30 minutes to ensure they were not damaged creating a short to later explode on you in the trunk of your car.

Yes, these packs are great and one must apreciate the new dangers of them and give them the respect they need.
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02-29-2004 02:58 AM  16 years ago
markfsanderson

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Houston, Republic of Texas; USA

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LiPo Batteries . . .
Thanks . . I've a Mark II, a great little charger . . I bought it for my new aerohawk - NiMH battery.

Regards,
Mark F. Sanderson
Mark F. Sanderson
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02-29-2004 07:59 AM  16 years ago
Fredrik R

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Habo, Sweden

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I've got an Simprop Intellicharger V3 that I'm totally happy with.
Great display too, with backgroundlight

Fredrik
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