HobbyKing.com New Products Flash Sale
Thread Tools
Old Feb 08, 2009, 11:03 PM
I can crash real good.
Shreveport, LA
Joined Dec 2008
200 Posts
Charge Rate formula

Can someone point me to the thread that has the formula that tells how fast you can charge a lipo safely...
i.e. thunder power 1320 2s 7.4v
poboy62 is offline Find More Posts by poboy62
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 09, 2009, 03:52 AM
Registered User
Staffs, UK
Joined Nov 2003
11,158 Posts
It's a very simple formula. Charge rate (mA) = battery capacity (mAh).

I.e. 1320mAh battery, charge rate 1320mA (or 1.32A)
2200mAh battery, charge rate 2200mA (or 2.2A)

You'll see people calling that a charge rate of C or 1C.

slipstick is online now Find More Posts by slipstick
Reply With Quote
Old Feb 09, 2009, 05:37 AM
Air, Ground & Water
freechip's Avatar
Canada, ON, Rockland
Joined Aug 2008
25,775 Posts
Some brands of lipo can be safely charged faster with proper charger/balancer, but that should be done by someone that knows all the IN & OUT of lipo charging and pratices safe lipo charging.
freechip is online now Find More Posts by freechip
Reply With Quote
Old Feb 09, 2009, 07:01 AM
jackerbes's Avatar
USA, ME, Ellsworth
Joined May 2008
17,503 Posts
Use the battery maker's recommendations for the charging rate. Here is what ThunderPower has to say about it:

"..(7) NORMAL CHARGING: The charge rate should not exceed 1C (one times the capacity of the battery, unless otherwise noted*). Higher setting may cause problems which can result in fire. For example: Charge a 730mAh battery at or below 0.73Amps. Charge a 5000mAh battery at or below 5Amps. Thunder Power packs with balancing connectors can be used with TP balancers for safer charging. For
more information, please visit: www.thunderpowerrc.com

*To charge at greater than 1C (no more than 3C): You must use a Thunder Power 1010C charger in conjunction with a Thunder Power Balancer (205 or 210) and data cable. Only ProLite 910, 1320, 2000 and 2100 cells qualify for charging up to 3C."

Note that *only* the top of the line ProLite cells can be charged at up to 3C. I still would not do it unless I was waiting to use the cell, it is going to take some life out of the battery and it just does not make sense to use high rates needlessly.

jackerbes is offline Find More Posts by jackerbes
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Max charge rate for AR's? Kosh Electric Plane Talk 8 Oct 13, 2001 01:49 PM
What is safe charge rate for 2000 Nimh Panasonics ? Al P Electric Plane Talk 5 Jul 18, 2001 12:22 AM
'Green' 500 ARs - maximum charge rate? Bill Glover Electric Plane Talk 6 May 23, 2001 12:30 AM
For 9.6V 1600ma NIMH battary what is the charge rate and charge time? clchen Electric Plane Talk 7 May 06, 2001 09:06 PM
For 9.6V 1600ma NIMH battary what is the best charge rate and charge time?(more) clchen Parkflyers 1 May 06, 2001 04:23 AM