# Is 45c battery too much?
**URL:** https://foil.zone/t/is-45c-battery-too-much/14867
**Category:** Electronics (ESC, remote, batteries)
**Created:** [January 2, 2022, 2:55am UTC](https://foil.zone/t/is-45c-battery-too-much/14867 "2022-01-02T02:55:26Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@nathanstew7](https://foil.zone/u/nathanstew7)
#### Post date: [January 2, 2022, 2:55am UTC](https://foil.zone/t/is-45c-battery-too-much/14867/1 "2022-01-02T02:55:27Z")
Hi there,
I am building my first efoil and am looking to select a battery that will work for the build. I am looking to connect two 6s 10000mah batteries in series, and they will power the Flipsky 65161 motor (with a 300a ESC - watercooled). My local hobby shop has some available, but they have a C rating of 45C. Is this too much? I’m not totally sure what this indicates, and the hobby shop owner told me that this could cause a buildup of heat.
Any help is appreciated!
Nathan
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### Author:  [@TME222](https://foil.zone/u/TME222)
#### Post date: [January 2, 2022, 8:06am UTC](https://foil.zone/t/is-45c-battery-too-much/14867/2 "2022-01-02T08:06:00Z")
C rating is the maximum allowed discharge current of the battery. C = Maximum discharge current/Battery capacity.
There is noting bad about a high C number, however beware chinese manufacturers often do not fulfill the specification.
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [January 2, 2022, 6:07pm UTC](https://foil.zone/t/is-45c-battery-too-much/14867/3 "2022-01-02T18:07:26Z")
Higher C actually gives lower heating for the same current so i wonder what the shop owner was on about.
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### Author:  [@nathanstew7](https://foil.zone/u/nathanstew7)
#### Post date: [January 2, 2022, 9:10pm UTC](https://foil.zone/t/is-45c-battery-too-much/14867/4 "2022-01-02T21:10:21Z")
Thank you guys for the help!
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### Author:  [@Alexandre](https://foil.zone/u/Alexandre)
#### Post date: [January 3, 2022, 9:28am UTC](https://foil.zone/t/is-45c-battery-too-much/14867/5 "2022-01-03T09:28:01Z")
The way i see lipo rating ( as far as I tested) just to be safe:
You take the number written on the lipo :C rating /2
You are supposed to live around 20% in the lipo at the end
So for exemple with 10 000mah (10A) rated at 40C
10 x 0.20. X. 40/2= 40A
This battery will probably handle a constant 40A discharge rate all the way to the end without any problem ( heat, swelling …)
Depending on quality brand … it can be a lot higher or not 😤
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [July 25, 2022, 5:57am UTC](https://foil.zone/t/is-45c-battery-too-much/14867/6 "2022-07-25T05:57:11Z")
That’s some weird magic in your post?
10Ah 40c would be 400A capable if the manufacturer was honest. Since they’re not i agree that the C-rating should be halved so the battery is capable of 200A peak but the 0.2 factor seems overly strict? I’f i really needed 200A fully continuous (and 100% full throttle use rarely happens) then i’d halve the c-rating again to 10C and do two of those packs in parallel for 200A.