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Old Apr 16, 2012, 09:15 AM
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batteries in series

Iím thinking about buying two 2 cell batteries instead of using one 4 cell. I just want to make sure that my findings are correct.

25c 1500mah battery = 37.5 amps discharge rate

if i put this battery in series will it equal to 75 amps discharge rate?
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Old Apr 16, 2012, 09:19 AM
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Ken Myers's Avatar
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Quote:
Originally Posted by Mikep0011 View Post
I’m thinking about buying two 2 cell batteries instead of using one 4 cell. I just want to make sure that my findings are correct.

25c 1500mah battery = 37.5 amps discharge rate

if i put this battery in series will it equal to 75 amps discharge rate?
No, it will still be 37.5 amps maximum discharge rate.

They need to be in parallel to increase the amperage rating. Then you would have a 2S2P pack. Probably not what you are after.
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Old Apr 16, 2012, 09:33 AM
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Thanks a lot for your quick response. yeah I'm looking for a 60 amp draw. I'll then have to up the c rating of the batteries.
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Old Apr 16, 2012, 09:46 AM
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You do realize that there are no 1500mAh lipoly cells that can sustain a 60 amp draw on a repeated basis without suffering certain damage?

Your best bet at coming close to this goal are the Thunder Power G6 65C packs. They're not cheap but if you need a 60A draw from a 1500mAh pack, they will most certainly serve you better than nearly all other lipolys that are currently available.

Mark
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Old Apr 16, 2012, 03:47 PM
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Wouldnt a 45c battery 1500mah give me 67.5 amps?

I found this battery this should give me a little over 60 amps continuous right?
http://www.hobbypartz.com/77p-sl1600-2s1p-40c-2222.html
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Old Apr 16, 2012, 05:13 PM
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Do you realize how fast a 1500mah battery drawing 60 amps will be discharged. It will be dead in about a minute and a half. The correct solution to your 60 amp draw will be to increase the mah not the C. You should really be looking at something like a 4500mah 20C battery.

Glen
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Old Apr 16, 2012, 05:30 PM
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Originally Posted by Mikep0011 View Post
Wouldnt a 45c battery 1500mah give me 67.5 amps?

I found this battery this should give me a little over 60 amps continuous right?
http://www.hobbypartz.com/77p-sl1600-2s1p-40c-2222.html
If you believe the label, yes. Problem is that there is no such thing as 1500mAh pack that can repeatedly sustain a 60 amp draw without suffering irreparable damage. Labels lie, plain and simple.

Glen is absolutely correct (as usual). You need a MUCH bigger battery if you need to sustain 60A draw throughout the discharge, and hope to do so for more than a few discharges.

Mark
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Old Apr 16, 2012, 07:33 PM
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Alright I understand, Thanks alot for your help

If intrested there was a couple of factors which had me thinking into going with two 2 cells instead of one 4 cell battery.
1. The 2 cell packs were lighter together, than one big 4 cell. ( so more mah longer flight)
2. The charger I own can only handle 5 amps of charge, but with 4 cell it was 3.5 amps. Thinking a 2 cell can charge faster.

Conclusion: Need to stop being a cheap arse!!

Thanks again!!
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