SMALL - Telemetry SMALL - Radio
Thread Tools
Old Jun 11, 2011, 09:05 PM
slowflie is offline
Find More Posts by slowflie
Registered User
Joined Jun 2011
17 Posts
Help!
LiPo Charging RATE???

So this may be a dumb question.... but here is goes. So my lipo charger charges at 650mah,,, Can I charge a battery that 450mah?? or will it EXPLODE??? thanks!

Oh the battery is a 20 C discharge rate.
slowflie is offline Find More Posts by slowflie
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 11, 2011, 09:33 PM
z-matrix is offline
Find More Posts by z-matrix
just look at it smokin'
z-matrix's Avatar
Joined Dec 2005
1,233 Posts
Quote:
Originally Posted by slowflie View Post
So this may be a dumb question.... but here is goes. So my lipo charger charges at 650mah,,, Can I charge a battery that 450mah?? or will it EXPLODE??? thanks!

Oh the battery is a 20 C discharge rate.
its safe to charge up to 1C (in your case it is 650mA), above 0C below 35C

some types state 5C

Z
z-matrix is offline Find More Posts by z-matrix
Reply With Quote
Old Jun 11, 2011, 09:39 PM
typeRA is online now
Find More Posts by typeRA
Zero Expo
typeRA's Avatar
San Diego, CA
Joined Mar 2009
792 Posts
mAh = quantity

mA = rate
typeRA is online now Find More Posts by typeRA
Reply With Quote
Old Jun 11, 2011, 09:48 PM
z-matrix is offline
Find More Posts by z-matrix
just look at it smokin'
z-matrix's Avatar
Joined Dec 2005
1,233 Posts
Quote:
Originally Posted by typeRA View Post
mAh = quantity

mA = rate
oh yes, 650mA discharge in 1 hours is 650mAh
z-matrix is offline Find More Posts by z-matrix
Reply With Quote
Old Jun 12, 2011, 03:14 AM
slipstick is online now
Find More Posts by slipstick
Registered User
Staffs, UK
Joined Nov 2003
11,632 Posts
Quote:
Originally Posted by slowflie View Post
So this may be a dumb question.... but here is goes. So my lipo charger charges at 650mah,,, Can I charge a battery that 450mah?? or will it EXPLODE??? thanks!

Oh the battery is a 20 C discharge rate.
I think you're saying your battery has a capacity of 450mAh and your charger has a fixed charge rate of 650mA (not mAh). If that's what you mean then that charger will normally only be safe for batteries with capacities of 650mAh or more.

You might be o.k. if your 450mAh battery specifically says that it can be charged at more than 1C. Otherwise the charger is throwing too much current into it to be safe. BTW knowing the discharge rate doesn't help you decide on what charge rate is safe .

Steve
slipstick is online now Find More Posts by slipstick
Reply With Quote
Old Jun 12, 2011, 04:37 AM
evo101 is online now
Find More Posts by evo101
Registered User
evo101's Avatar
Australia, QLD, Indooroopilly
Joined Jun 2009
1,096 Posts
can some one clear this one up for me, my charger can charge at 10amps my batteries say can charge up to 2c

so i have been charging at 10amps on my batteries is that bad or good? people tell me it should take hours to charge my batterys but i charge 5s in about and hour and 3s in about 30min all state charge up to 2c
evo101 is online now Find More Posts by evo101
Reply With Quote
Old Jun 12, 2011, 07:31 AM
Hughes500Bob is offline
Find More Posts by Hughes500Bob
Retired CFI Helicopter
Hughes500Bob's Avatar
Southeast PA
Joined Jun 2007
1,610 Posts
http://www.tjinguytech.com/charging-how-tos

^^^^^ EXCELLENT LIPO INFO^^^^^^^

Simplified:

A 450 mAh pack at a 1C charge rate is .45 amps = 1 hour charge time
Charging a 450 mAh pack at .65 amps = 1.44C charge rate = 42 minutes charge time
Charging a 450 mAh pack at .9 amps = 2C charge rate = 30 minutes charge time

If your 450 mAh pack has a 2C or higher CHARGE RATE capability then it is perfectly OK.

Do not confuse the max C rating for charging with the C rating of the pack for discharge/burst. They are two completely different specs.
Hughes500Bob is offline Find More Posts by Hughes500Bob
Reply With Quote
Old Jun 12, 2011, 09:42 AM
Wintr is offline
Find More Posts by Wintr
Registered User
Wintr's Avatar
USA, MO, Florissant
Joined Nov 2010
2,213 Posts
Quote:
Originally Posted by spyda00 View Post
can some one clear this one up for me, my charger can charge at 10amps my batteries say can charge up to 2c

so i have been charging at 10amps on my batteries is that bad or good? people tell me it should take hours to charge my batterys but i charge 5s in about and hour and 3s in about 30min all state charge up to 2c
Can't answer without battery capacity. Or, are you just trolling?
Wintr is offline Find More Posts by Wintr
Reply With Quote
Old Jun 13, 2011, 07:29 AM
evo101 is online now
Find More Posts by evo101
Registered User
evo101's Avatar
Australia, QLD, Indooroopilly
Joined Jun 2009
1,096 Posts
3600 4s, what do u mean buy trolling ? i thought it was a good place to ask a question???


Quote:
Originally Posted by Wintr View Post
Can't answer without battery capacity. Or, are you just trolling?
evo101 is online now Find More Posts by evo101
Reply With Quote
Old Jun 13, 2011, 08:35 AM
Hughes500Bob is offline
Find More Posts by Hughes500Bob
Retired CFI Helicopter
Hughes500Bob's Avatar
Southeast PA
Joined Jun 2007
1,610 Posts
Quote:
Originally Posted by spyda00 View Post
3600 4s, what do u mean buy trolling ? i thought it was a good place to ask a question???
3600 4S 1C charge rate is 3.6 amps 3.6 x 16.8v = 60.48 watts

Your charging at 10 amps = 2.78C charge rate =168 watts

To answer your question .... if your packs are RATED FOR 3C or HIGHER charge rates than you are "most likely" NOT damaging them.

If you packs are 2C MAX rated for charging you should reduce your amp rate to 7.2 amps.

Charging rates are "highly dependent" on the quality of the cells/pack.

ALWAYS consult the manufacturers specs for your battery packs.
Hughes500Bob is offline Find More Posts by Hughes500Bob
Reply With Quote
Old Jun 13, 2011, 07:16 PM
Wintr is offline
Find More Posts by Wintr
Registered User
Wintr's Avatar
USA, MO, Florissant
Joined Nov 2010
2,213 Posts
Quote:
Originally Posted by spyda00 View Post
3600 4s, what do u mean buy trolling ? i thought it was a good place to ask a question???
It's just that this thread had already covered charge rate vs. capacity. I thought maybe you were being ironic by leaving that detail out. We get that, sometimes.
Wintr is offline Find More Posts by Wintr
Reply With Quote
Old Oct 20, 2013, 05:49 PM
baddley is offline
Find More Posts by baddley
Registered User
United States, WV, Salem
Joined Mar 2006
187 Posts
Hi

Does anybody now were there is a chart with charge rates for different capacity LIPO's ? For example I think it would be convenient to able to see how many amps you would need to charge at a 1c or 5c charge rate for different MAH batteries

Thanks
Scott
baddley is offline Find More Posts by baddley
Reply With Quote
Old Oct 20, 2013, 09:48 PM
hoppy is offline
Find More Posts by hoppy
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
22,020 Posts
Multiply mah of battery by recommended C-charge rate to get max charge rate.

3000mah pack and 2C charge rate = 6000ma charge rate.(6A)
5000mah and 5C charge rate = 25,000ma charge rate (25A)
500mah and 1C = 500ma (0.5A) charge rate.
hoppy is offline Find More Posts by hoppy
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Question about charging rate on Turnigy lipos Patriek Batteries and Chargers 2 May 26, 2011 05:42 AM
Discussion charging 12v PB BATTERY SAFE CHARGE RATE? flysohigh Batteries and Chargers 2 Mar 17, 2011 12:31 PM
Question Charging at a LOWER rate? james1300 Batteries and Chargers 30 Mar 17, 2011 03:32 AM
Discussion lipo charging rate question CaptEvo Batteries and Chargers 5 Mar 15, 2006 02:47 PM
Modifying charging rate on lipo charger Park_Pilot Batteries and Chargers 0 Aug 09, 2004 11:56 AM