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replace 12v with a lipo

Old 07-01-2010, 12:56 AM
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dsr71
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Default replace 12v with a lipo

hello all i would like to replace the 12volt battery for my hand starter with a lipo what cell count (3s-4s)burst count (20c-30c so )and capacity thanks in advacne
Old 07-01-2010, 03:06 AM
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gadix
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Default RE: replace 12v with a lipo

i assume you would need a 5000mah with 40c as a starter is a very high power dc motor
i would suggest to get the old nimh/nicd 1.2 6000 mah batt,(the type used for rc cars) and you build your own pack from it

e.g: http://www.batteryjunction.com/1pc12v50mahn.html

hope this helps


Old 07-01-2010, 06:51 AM
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playntraffic
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Default RE: replace 12v with a lipo

4s, 20C, 3000mah

use it short bursts or the starter motor will heat up
Old 07-01-2010, 09:14 AM
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Default RE: replace 12v with a lipo

Stick with a 3S pack if you want to go with a lipo for your starter. 4S is way over voltage the motor is designed for and will result in very high current draw
Pete
Old 07-03-2010, 01:09 AM
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mehrshad
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Default RE: replace 12v with a lipo

Lipo is not a good choice for your application. It needs current limit and cutoff control.
A 10 cell (3000-5000mah) NIMH will do the job better and its absolutely safe.

Old 07-03-2010, 08:56 AM
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soarhead-RCU
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Default RE: replace 12v with a lipo

I agree with the last poster, LIPO's are not the way to go for a starter motor because if you over discharge them they are ussually ruined and if they are not capable of the discharge amps they will puff and are then ruined.
I would use and have seen 4cell (14.4v peak, but will drop under load) 2300ma A123 tool cell packs used and they are ideal IMOH. Thats what they were developed for, to spin drills and other battery powered tools. They can deliver over 60 amps steadily and have heard of up to 100 for bursts. They can be charged very fast and if you overdischarge them they will bounce back well. Can be charged and will hold their charge for a very long time when not in use unlike Nickel type batteries that slowly drain down. They are TUFF!!!!!!!!!!

Just my opinion
Bob
Old 07-04-2010, 12:20 AM
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Default RE: replace 12v with a lipo

I have tried ten cell NICD packs on starters and was not happy. Step up to two 6-cell sub-c car packs and you'll be thrilled. Use at least 1500mah packs for good results.
The LiPo tool-pack cell types are very useful foo.

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