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« on: July 13, 2010, 10:18:33 PM »
prateek13
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i am thinking to solder my two lipos in parallel connection for a project

7.4 volt 1300mah 20-25c
and a 7.4 volt 850mah 15c battery

question is-what will happen to the c rating of the pack if connected in parallel connection? Bang Head Huh? Roll Eyes

please Help Me Help Me Bang Head
« Last Edit: July 14, 2010, 12:43:17 AM by anwar » Logged

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« Reply #1 on: July 13, 2010, 11:21:25 PM »
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you will fry the battery with the lower rating ....... Head Scratching
 explained as bellow
if you connect the two batteries than nothing will happen at that time , all will happen when you complete the circuit.. Grin
 now Giggle the bat with 25c will give out the power of approx 250 watts
it means that a total of 32amps of current will be flowing , and the later bat give 90watts means a total of 12amps
when both the batt are connected in parellel than according to kirchoff's law of current the rest of current [32-12=20A]
will be flowing thorugh the low rating battery and this huge current will fry your battery...... Grin Grin
its just a guess but results may vary , battery my blast , catch fire , or nothing will happen if my guess is wrong..... Grin
plz reply me your results... Thumbs Up Thumbs Up
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« Reply #2 on: July 14, 2010, 12:37:55 AM »
anwar
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In parallel it should be OK, is my understanding, if they are same cell count and start at similar voltages. 

The C rating should be based on the lower of the two.

Gurtejtoor - Just because a pack is capable of delivering a particular level of current, does not mean that it does so automatically.  It depends on the load connected.  In a parallel situation, the discharging of both packs would be in such a way that the voltage on both of them would come down together equally, and they will get discharged at the same time.

Series connection is a bigger problem, if the packs are of different mAH rating :

http://www.rcindia.org/beginners-zone/using-cells-of-different-amh/
« Last Edit: July 14, 2010, 12:44:06 AM by anwar » Logged

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« Reply #3 on: July 14, 2010, 12:55:00 AM »
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you right anwar , i always gets confused in parellel n series settings.. Grin Grin its really i big mess.
my answer would be right for series connection i guess..... Thumbs Up
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