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Old 08-27-2015, 05:52 AM #1
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Default Li-ion or Lipo battery source

I need some lithium ion or lithium polymer batteries to power my laser. What are some reputable suppliers? I need batteries that can handle at least 4A constant current.



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Old 08-27-2015, 04:35 PM #2
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Default Re: Li-ion or Lipo battery source

What size? Hobby king has good RC style battery packs.
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Old 08-27-2015, 04:42 PM #3
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Default Re: Li-ion or Lipo battery source

I second hobby king , I use them for rectangular bare cells .
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Old 08-28-2015, 06:46 AM #4
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Default Re: Li-ion or Lipo battery source

Hmm I was looking for something like this but with a higher constant current draw rating. Do you think I should just buy from Chinese suppliers or is that a bad idea?

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Old 08-28-2015, 08:14 AM #5
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Default Re: Li-ion or Lipo battery source

Found this 6Ah , 65~130C Discharge , more than the 4A max discharge you wanted but similar size and capable of it .

http://hobbyking.com/hobbyking/store...Lipo_Pack.html
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Old 08-28-2015, 12:59 PM #6
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Default Re: Li-ion or Lipo battery source

Quote:
Originally Posted by ionlaser555 View Post
Found this 6Ah , 65~130C Discharge , more than the 4A max discharge you wanted but similar size and capable of it .

Turnigy nano-tech A-SPEC 6000mah 1S 65~130C Hardcase Lipo Pack
Capacity: 6000mAh
Voltage: 1S2P / 1 Cell / 3.7V
Discharge: 65C Constant / 130C Burst
Weight: 143g (including wire, plug & case)
Dimensions: 93x47x18mm
Balance Plug: JST-XH
Discharge Plug: 4mm Bullet-connector to HXT4mm

Looks pretty good thanks! Max constant discharge rate = 65C = 6Ah*65 = 390A? That seems quite high.

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Old 08-29-2015, 05:03 AM #7
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Default Re: Li-ion or Lipo battery source

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Max constant discharge rate = 65C = 6Ah*65 = 390A? That seems quite high.
Yup. The cells are designed for low internal resistance, allows for high current draws.
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Old 08-29-2015, 03:55 PM #8
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Default Re: Li-ion or Lipo battery source

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Yup. The cells are designed for low internal resistance, allows for high current draws.
I guess RC motors require really high current draws. I was just surprised that it was this high.

This should work, thanks all!
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Old 08-30-2015, 12:37 AM #9
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Default Re: Li-ion or Lipo battery source

These can be quite high indeed. Normal operation on these things could be a flight time of 5 to 10 minutes so the discharge on average already needs to be 12C or so. This is however the average during that flight, at peak moments it could be a fair bit more so a (peak) 65C rating is not unrealistic.

For lasers you'd probably not use this much power, unless you wanted to make something really small with a thermally limited runtime and batteries to match.
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Old 08-30-2015, 02:08 AM #10
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Default Re: Li-ion or Lipo battery source

Quote:
Originally Posted by Benm View Post
These can be quite high indeed. Normal operation on these things could be a flight time of 5 to 10 minutes so the discharge on average already needs to be 12C or so. This is however the average during that flight, at peak moments it could be a fair bit more so a (peak) 65C rating is not unrealistic.

For lasers you'd probably not use this much power, unless you wanted to make something really small with a thermally limited runtime and batteries to match.
I calculated that I'd use at most 5A. I guess the higher limit doesn't have any downsides though. Though, maybe those new 40W blue diode arrays would need on the orders of 100A?
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