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Other › Charge Rate for TP LiPo's?
11-30-2005 07:11 PM  12 years agoPost 1
Red9301

rrApprentice

London UK

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Hiya.

I have done a search here and in the Batt section to no avail so I've decided to post a Q...

I have a Thunder Power Li-Po 2100mAh/11.1V
I have a Schulze Chamaleon isl 6-330d Field Charger.

I have no idea what rate to charge the Li-Po's at. Any advice on the highest charge rate these batts will take? They came loose and without instructions and being an electric noob, i'm getting confused with all the abreviations etc.. How do I work it out?

Any advice appreciated, as I dont wanna ruin my pack!

Cheers

Red

Making crashing an art form...

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11-30-2005 07:15 PM  12 years agoPost 2
Helifool

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Rochester New York

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You cannot charge them over 1c so you cannot charge above 2.1amps with the 2100mah battery.

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11-30-2005 07:19 PM  12 years agoPost 3
BisonFlyer

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Winter Garden, FL

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that battery can be charged at 1C. What that means is for a 2100mah pack, you can charge it at 2.1amps. For a 1500mah pack, 1C is 1.5 amps, etc etc. To really extend the life of your lipos its better to charge them at 1.5 amps (about 75% of max charge rate) whenever possible. NEVER charge at anything higher than 2.1amps however. Also make sure that you never discharge them below 9 volts (3 volts per cell - so for a 3 cell pack dont ever go below 9 volts)

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11-30-2005 07:19 PM  12 years agoPost 4
Red9301

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London UK

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Ok cool thanks for that. Erm, dumb question, but what does 1c mean?

Edit: Thanks Bison!! Thats sorted me out. Its finally clicked into place...

Told you I'm a leccy noob

Making crashing an art form...

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11-30-2005 07:55 PM  12 years agoPost 5
Obsessive

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41.73N 71.41W

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If the battery is 2,100mAh, charge it at the rate of 2,100mAh/h....

If you're using an Astro 109 Lithium charger, rotate the knob to 2.1

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11-30-2005 08:39 PM  12 years agoPost 6
keyz

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, UK

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always slow , with caution , and style ...........at least thats what ive always been told lol
any pack of mine no matter what size gets charged at .8mah
slow but faithful

If you need to get high , go and fly !

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11-30-2005 08:50 PM  12 years agoPost 7
SBK

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NE Ohio

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Charged at 0.7C.
Don't discharge more than 80% of the capacity (meaning on recharge, you should get back in only <80% of capacity).
Don't discharge below 3.7V per cell.
Time your flight and don't fly until the headspeed drops.

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11-30-2005 08:50 PM  12 years agoPost 8
AnnihilaT

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The Netherlands

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Completely unneccessary to charge a 2100mah pack at .8 amps unless you are trying to balance / re-condition it. You are just wasting time. It doesnt prolong the life of the battery it just makes you wait longer to fly again. Sorry to contradict what you have been told.





A day without sunshine is like, well, night.

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11-30-2005 09:04 PM  12 years agoPost 9
keyz

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, UK

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hi MFIS-2

that charge rate suits me between working (flights between paperwork and fonecalls) lol , so long as it doesnt cause extra probs with batteries? im happy

If you need to get high , go and fly !

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11-30-2005 09:25 PM  12 years agoPost 10
AnnihilaT

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The Netherlands

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Well you certainly arent going to damage anything charging them at such a low rate Im just impatient and it would drive me nuts waiting that long for a pack to charge





A day without sunshine is like, well, night.

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11-30-2005 09:46 PM  12 years agoPost 11
nojohnny101

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10 miles north of Cincy, OHIO

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hey
when i recieved a battery pack from dymond-rc a 2100mah 15C 11.1v lipoly i called to ask about charge rates...

the guy said....like you guys have suggested....that you can charge them at 2.1 amps max (my charge maxes out at 2 amp charge rate) but he recommended to me to charge them at 1 amp because it would be less damaging to the batteries

he said that charging them at 1 amp would give me more cycles and better preformace towards the end of the batteries' life

Thanks
~Will~

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11-30-2005 10:05 PM  12 years agoPost 12
BisonFlyer

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Winter Garden, FL

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"You are just wasting time. It doesnt prolong the life of the battery it just makes you wait longer to fly again. Sorry to contradict what you have been told."

- that is bad advice, and simply wrong. If you charge your packs at a slower rate you get more cycles out of the life of the pack. Regardless of whether or not your impatient and dont do it, its still the truth. I dont always do it either, and often charge my packs at 2amps bc i want to go fly quickly again, but the fact remains that the slower the charge rate, the longer the overall service life of the pack will be

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11-30-2005 10:06 PM  12 years agoPost 13
CWallace

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Santa Rosa, CA

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Geeezzz.....

Sounds like buying a gun, and not being shown which end is the business end.

Don't know how you bought your batteries, but most are sold with a safety sheet that outlines all these issues. I guess since most of us have been doing this for awhile, we take alot for granted... like our vocabullary...

1C 15-20C Max discharge rate Do not charge unattended...

and the list goes on.

Keep asking questions......like most of our planes and Helis, LiPo's (ie: Lithium Polymer Batteries) are not a toy, and need to be handled with great respect.

Good Luck, be safe!

Cw

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11-30-2005 10:16 PM  12 years agoPost 14
AnnihilaT

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The Netherlands

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If you can show me anywhere in print from a manufacturer stating that charging at less than their recomendation of 1C will prolong the life of the battery i will believe it and stand corrected.





A day without sunshine is like, well, night.

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11-30-2005 10:21 PM  12 years agoPost 15
BisonFlyer

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Winter Garden, FL

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they dont print it bc they dont care about extending the life of the packs, bc then u buy fewer packs in the long term. They just quote the safe maximum charge rate that the pack can handle. If you actually speak to an honest member of any lithium company they will all tell you the same thing. ---- charging at less then max charge rate extends the life of the pack.

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11-30-2005 10:44 PM  12 years agoPost 16
JeepRubicon2k3

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CONUS

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11-30-2005 10:52 PM  12 years agoPost 17
Kevino_heli_man

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Valencia, CA United States

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On the back of the Apex 220 lipos it says
Warning:
...............
............
...............
Do not discharge below 3 volts per cell
Do not charge at a rate greater than recommended by the manufacture.
I contacted the manufacture and they say that the batterys should not be charged at more than 1amp.

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11-30-2005 11:40 PM  12 years agoPost 18
AnnihilaT

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The Netherlands

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Ok....again...Is there any SOLID evidence to support the claim that charging your lipo packs at less than 1C will extend the life of them? If so what is the technical reason for this? If they can discharge at 9-20C why would it harm them to recharge them at only 1C?

Someone mentioned a manufacturer told them 1 amp is what they should charge a pack at. They did not however specify the SIZE of that pack.

Someone else posted a thunder power standard warnings and guidelines which ALL of us should already know by heart. However it says nothing at all about charging at LESS than 1C to extend the number of cycles you will get on the packs.

So far there is still noone with a good technical reason why this should be true and also noone with any solid evidence in print from a reputable source that this is true.

Im not trying to start an argument here - I just dont accept something as fact based on hearsay or second hand knowledge unless a good reason can be given. So far all i have heard is speculation and 2nd hand info.

I think its also important to keep in mind that a charging cycle based on 1C charging rate will only be feeding the pack at 1C for about 50-75% of the charge time. Lipo chargers will continually back off the amp rate as they charge especially as it nears the end of the charge cycle. So even when you are charging at 1C the pack isnt even actually being charged at 1C for a considerable portion of the charge time.





A day without sunshine is like, well, night.

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12-01-2005 12:15 AM  12 years agoPost 19
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
Someone mentioned a manufacturer told them 1 amp is what they should charge a pack at. They did not however specify the SIZE of that pack.
i said it was:
when i recieved a battery pack from dymond-rc a 2100mah 15C 11.1v lipoly
I just dont accept something as fact based on hearsay or second hand knowledge unless a good reason can be given. So far all i have heard is speculation and 2nd hand info.
i'm not going to ignore a company's info (who are experts in battery technology because they make them) when i ask them a specific question...he knew how big my battery pack was when i called beaucse he asked....

i'm not saying it is right....buy why ignore a suggestion that someone makes who have a considerable amount of knowledge about it....


i guess you could just call it being on the "safe side"


Thanks
~Will~

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12-01-2005 01:13 AM  12 years agoPost 20
AnnihilaT

rrKey Veteran

The Netherlands

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Jonny,

I was talking about this guy who said
On the back of the Apex 220 lipos it says..... etc





A day without sunshine is like, well, night.

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