R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 01-22-2008, 06:37 PM   #1
Tech Regular
 
papadocks's Avatar
 
Join Date: Mar 2005
Location: naples florida
Posts: 391
Trader Rating: 3 (100%+)
Default what do you charge at (lipo)

i got this from orions web site ..................
How many amps should Li-Po batteries be charged at?
We recommend a maximum rate of 4.8A for the 4800mAh and 3,2A for the 3200mAh
papadocks is offline   Reply With Quote
Old 01-22-2008, 06:41 PM   #2
Tech Apprentice
 
ZipZap's Avatar
 
Join Date: Apr 2004
Location: No VA
Posts: 84
Trader Rating: 1 (100%+)
Default

1C is a good rate for battery longevity. Charging faster just wears them out quicker.
ZipZap is offline   Reply With Quote
Old 01-22-2008, 06:47 PM   #3
Tech Regular
 
papadocks's Avatar
 
Join Date: Mar 2005
Location: naples florida
Posts: 391
Trader Rating: 3 (100%+)
Default

this is from max amps site

Charging: Lithium Polymer batteries have specific charging requirements and ONLY chargers rated for Lithium Polymer cells may be used. The best chargers are those which require the user to manually select cell count and charge rate for each pack of cells, then automatically check to see that the settings are correct. The Hyperion EOS Charger line belongs to this category. Chargers which use only automatic detection of cell count (and on that basis set charge voltage) are prone to error, and can damage cells or cause a fire due to over-voltage charging of cells. We recommend that these chargers be set manually, if used. Other chargers are set manually, but do not include a safety circuit to oversee that setting. These are prone to user error, and should also be checked very carefully to insure proper use.

Lithium CC/CV chargers, like those in the Hyperion EOS Charger line, must be used. These charge initially at a constant 4.2V and constant 1C rate, then taper the charge rate as the battery nears full capacity. Cells are about 90% charged in one hour, and can be left connected for another 20-30 minutes to complete the charge. The maximum permissible charge voltage per cell is 4.2V. The maximum recommended charge rate for Lithium Polymer cells is 1C (ex: 1.5A for a 1500mAh pack). Please do not charge your lithium polymer at any rate higher than 1C. Doing so may reduce the capacity and life cycle of the cells, with very little savings in charge time.
papadocks is offline   Reply With Quote
Old 01-22-2008, 06:48 PM   #4
Tech Regular
 
papadocks's Avatar
 
Join Date: Mar 2005
Location: naples florida
Posts: 391
Trader Rating: 3 (100%+)
Default

i have always charged at 2 amps ......what do you guys charge at?
papadocks is offline   Reply With Quote
Old 01-22-2008, 06:51 PM   #5
Tech Fanatic
 
gndprx's Avatar
 
Join Date: Dec 2005
Location: Fort Mill, SC
Posts: 791
Trader Rating: 18 (100%+)
Default

1C as outlined above. Unless the pack builder specifically states otherwise.
gndprx is offline   Reply With Quote
Old 01-22-2008, 06:55 PM   #6
Tech Regular
 
papadocks's Avatar
 
Join Date: Mar 2005
Location: naples florida
Posts: 391
Trader Rating: 3 (100%+)
Default

this means you can charge a 4800 pack at 4.8 amps
papadocks is offline   Reply With Quote
Old 01-22-2008, 07:03 PM   #7
Tech Adept
 
Xray To The Max's Avatar
 
Join Date: Jun 2007
Location: Melbourne, Australia.
Posts: 175
Trader Rating: 4 (100%+)
Default

Sure Does
__________________
Ryan Maker - Team Xray - Hudy - Speed Passion - Ko Propo - Ryan Dezign.
Xray To The Max is offline   Reply With Quote
Old 01-22-2008, 07:08 PM   #8
Tech Elite
 
chris moore's Avatar
 
Join Date: Mar 2004
Location: Phx AZ
Posts: 3,780
Trader Rating: 88 (99%+)
Default

Quote:
Originally Posted by papadocks View Post
this means you can charge a 4800 pack at 4.8 amps
Yep, that is the safest level. This is one place where lipo is somewhat like nimh, if you charge at a higher level; say 2C; you will see some improved punch from the pack just the same way you do from charging nimh's at 7 or 8amps. But you risk damaging the cells and other bad events like lipo fires.
chris moore is offline   Reply With Quote
Old 01-22-2008, 08:41 PM   #9
Tech Elite
 
VooDooPH's Avatar
 
Join Date: Feb 2006
Location: Philippines
Posts: 3,715
Trader Rating: 18 (100%+)
Send a message via Yahoo to VooDooPH
Default

lipo race packs... charge at 1C
lipo tx pack... charge at 1A
__________________
[TRF418][TB-04Pro][FF-03Pro][M-05v2][TRF102][F-104 WGP][TT-01R TypeE]
[Cross CF-01'08][Yokomo R12][Team C TC02Evo][Team C T8E v3]
VooDooPH is offline   Reply With Quote
Old 01-23-2008, 03:01 AM   #10
Tech Fanatic
 
Frank McKinney's Avatar
 
Join Date: Aug 2001
Location: A Yank in England
Posts: 755
Default

Quote:
Originally Posted by papadocks View Post
this is from max amps site

Charging: Lithium Polymer batteries have specific charging requirements and ONLY chargers rated for Lithium Polymer cells may be used.
I've wondered about something related to this for some time - My Creative Zen charges from my computer's USB port, and iPods and some mobile phones do the same. You can also get 'official' chargers from Motorola, Nokia and others that just direct the 12v power from your car ciggie lighter into your Li-Po pack.

Are the batteries just made that cheaply that they can be mis-charged this way (5v supply I think?) or is there actually some sort of spec in the USB spec that allows the Li-Po batteries to be 'properly' charged?

I can imagine the wall wart chargers have the ideal circuitry to handle Li-Po packs, but can USB ports and the cigarette lighter plugs have this same circuitry? Anyone know?

Just curious
__________________
Minimal signature to save screen space! Big sigs suX0r
Frank McKinney is offline   Reply With Quote
Old 01-23-2008, 03:16 AM   #11
Tech Lord
 
syndr0me's Avatar
 
Join Date: Dec 2004
Location: 5280 Raceway
Posts: 13,140
Trader Rating: 32 (100%+)
Default

Quote:
Originally Posted by chris moore View Post
Yep, that is the safest level. This is one place where lipo is somewhat like nimh, if you charge at a higher level; say 2C; you will see some improved punch from the pack just the same way you do from charging nimh's at 7 or 8amps. But you risk damaging the cells and other bad events like lipo fires.
That's false. 2C charging does absolutely nothing to improve battery performance, and will only lead to a battery that doesn't last as long. It's been proven many times over that charging above 1C has no benefits at all, outside of charging the battery a little faster. The drawback is that it could cut down your battery's life significantly, or maybe be unsafe if you're dealing with a lower quality cell.
syndr0me is offline   Reply With Quote
Old 01-23-2008, 04:07 AM   #12
Tech Elite
 
joe of loath's Avatar
 
Join Date: Mar 2007
Location: Bristol, England, United Kingdom
Posts: 4,857
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by Frank McKinney View Post
I've wondered about something related to this for some time - My Creative Zen charges from my computer's USB port, and iPods and some mobile phones do the same. You can also get 'official' chargers from Motorola, Nokia and others that just direct the 12v power from your car ciggie lighter into your Li-Po pack.

Are the batteries just made that cheaply that they can be mis-charged this way (5v supply I think?) or is there actually some sort of spec in the USB spec that allows the Li-Po batteries to be 'properly' charged?

I can imagine the wall wart chargers have the ideal circuitry to handle Li-Po packs, but can USB ports and the cigarette lighter plugs have this same circuitry? Anyone know?

Just curious
no, the circuitry is built into the device. if my old media player (RIP) was flat i could charge it from a 4 cell pack.
__________________
HPI E-Firestorm - Tamiya TA05 racer (carbon chassis, 10.5 brushless etc) - LRP Blast S10 BX - Revo 2.5r truggy conversion (in progress)
joe of loath is offline   Reply With Quote
Old 01-23-2008, 04:16 AM   #13
Tech Champion
 
TryHard's Avatar
 
Join Date: Jun 2004
Location: Sydney, NSW
Posts: 5,284
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by syndr0me View Post
That's false. 2C charging does absolutely nothing to improve battery performance, and will only lead to a battery that doesn't last as long. It's been proven many times over that charging above 1C has no benefits at all, outside of charging the battery a little faster. The drawback is that it could cut down your battery's life significantly, or maybe be unsafe if you're dealing with a lower quality cell.
On this point, I try and charge at 1C every time, however sometimes our clubs racing meetings are a little tight on time, so I will bump it up to 1.5C (quite amusing grabbing the calculator quickly to figure out what amp rate that makes ), but never higher. I know that not having a fully charged pack doesn't really make a diff with LiPo... but I'm still converting my brain over to the ease of use of LiPo's
However, if I'm charging at home before a meeting then 1C it is.

HiH
Ed
__________________
| THard.co.uk | Xray | MuchMore |
TryHard is offline   Reply With Quote
Old 01-24-2008, 05:57 AM   #14
Tech Fanatic
 
Frank McKinney's Avatar
 
Join Date: Aug 2001
Location: A Yank in England
Posts: 755
Default

Quote:
Originally Posted by joe of loath View Post
no, the circuitry is built into the device. if my old media player (RIP) was flat i could charge it from a 4 cell pack.
AAAAAAHHHHHHHHHhhhhhhhhhhhhh... OK i c now I have been wondering for years how this works, thanks!
__________________
Minimal signature to save screen space! Big sigs suX0r
Frank McKinney is offline   Reply With Quote
Old 01-24-2008, 12:44 PM   #15
Tech Addict
 
KE4PJO's Avatar
 
Join Date: Feb 2002
Location: Columbia,Tn.
Posts: 642
Default

I charge @ 1C, through a balancer (I know it takes longer), and with nearly 100 cycles in 2 months, my Orion 3200 performs as well as new.
KE4PJO is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
First Charge - lipo FOXY923 Radio and Electronics 1 05-29-2008 06:47 PM
WILL IT HANDLE TO CHARGE MY LIPO? Rolex Rookie Zone 1 03-08-2008 09:00 PM
what amps to charge at (lipo) papadocks Electric Off-Road 2 01-22-2008 07:38 PM
trying to charge a lipo Frank78 Electric Off-Road 9 11-27-2007 06:54 PM
lipo charge times? streetracer745 Electric Off-Road 3 04-30-2007 06:49 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 10:35 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net