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HelicopterMain Discussion › can I mix a 2150mah with a 2100mah lipo pack?
09-16-2007 11:06 PM  10 years agoPost 1
suthunboi

rrApprentice

California

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One of my batts in my 2100mah pack is causing a power loss. I have (2) 2150mah batts. I want to put one 2100 batt with two 2150s.Will mixing the two cause any problems? Thanks for the help in advance.

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09-16-2007 11:12 PM  10 years agoPost 2
george0079

rrElite Veteran

USA

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yes. it will cause problems.
it will not work.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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09-16-2007 11:29 PM  10 years agoPost 3
suthunboi

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California

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thanks. I appreciate the help.

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09-17-2007 06:01 AM  10 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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Of course the 2100 mah cell can go fully discharged before the other 2 2150 mah packs since it's a lower capacity cell. And you should only charge it as a 2100 mah pack, not a 2150, or you risk puffing the 2100 mah cell or worse (fire).

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-17-2007 09:43 AM  10 years agoPost 5
kangarooster

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Orlando Fl-USA

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09-17-2007 09:48 AM  10 years agoPost 6
mjsb

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Laredo, TX

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You will spoil your pack and maybe fry your heli....but you can stiil use it

--------------------------
If life turns its back on you....then grab it by the buttocks!

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09-17-2007 12:38 PM  10 years agoPost 7
zx7rider

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Manalapan,NJ

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It is Possible
check with fromeco

What goes up, Has to come down. Usually in 1 piece.

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09-17-2007 03:26 PM  10 years agoPost 8
MJWS

rrKey Veteran

Airdrie, AB - Canada

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Whether this is a good idea depends completely on how you intend to use the packs. At low current draws it is a complete non-issue. Especially with packs only 50mah apart.

Here is a good thread with some decent discharge graphs and good discussion on what happens when two very different packs are paralleled.

http://www.rcgroups.com/forums/showthread.php?t=360273

Bottom line is you CAN NOT expect to safely draw double the current. If the packs are wildly different you won't get the increase in runtime that you think would occur. In your case the packs are so close you may well get very close to a 'normal' 80% discharge of roughly 4200mah (2 packs). Test. Test. Then test.

I'd charge and balance separately for increased safety and to get a thorough understanding of how each pack is behaving. Life is much simpler if you parallel and/or series up matched packs. There are probably two dozen good threads on this on rcg.

Mike

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HelicopterMain Discussion › can I mix a 2150mah with a 2100mah lipo pack?
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