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« on: November 07, 2012, 08:25:53 PM »
docsree
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Hi, i recently bought a 4 channel heli from a member of this forum. the battery specs are 3.7 v, 1600 mah Li po. It used to last for 7 to 8 min after appr 1 hour of charge. After about 20 flights, it lasts for about 2 minutes !!. I wonder if this is the total lifespan of batteries ? i followed the basic precautions for Li po. I know different company batteries have different performances but can any one explain how long a good battery lasts, so that newbies like me would have a realistic idea about RC stuffs before venturing further. Also i would welcome help in buying a replacement battery for GT 8008 (which is a great heli for beginners).

Thanks in advance.
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« Reply #1 on: November 07, 2012, 09:00:30 PM »
sushil_anand
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Might help if you asked this of the  member who sold it to you. He may well be aware of the issue and could guide you accordingly.
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« Reply #2 on: November 07, 2012, 09:06:11 PM »
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+1 get back to the member who sold it to you.
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« Reply #3 on: November 07, 2012, 09:07:25 PM »
anwar
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If you did not over discharge it, then it should typically last longer.  Not over discharging LiPos requires a level of self discipline and control, which is hard to do if you aim to fly until the heli drops down because the battery is drained down.  It is common for people to do that in the excitement of flying.  A typical symptom would be that most lipos would puff up (gradually) when over discharged.
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« Reply #4 on: November 07, 2012, 09:11:08 PM »
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Yes Anwar, LiPos are not what they are puffed up to be!  >Cheesy Grin  :devilish grin: - need to add a new emoticon maybe?
« Last Edit: November 07, 2012, 09:13:35 PM by anwar » Logged

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« Reply #5 on: November 07, 2012, 09:44:25 PM »
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hi, im not really complaining about the product and i thought, it is a sort of useful information for beginners like me so I posted it separately. I searched through the forum and got to know a bit about the Li po s but all i wanted to know was how many 'cycles' would a LiPo last. And Anwar sir, how do i know im over-discharging the LiPo, when should one stop flying the heli. I typically was flying it till it was sort of week (although not complete or not till it would drop down) and stopped immediately. Thanks for your reply guys.
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« Reply #6 on: November 07, 2012, 10:52:35 PM »
anwar
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All of this has been discussed multiple times before Smiley  Let me point you to the specific posts.

http://www.rcindia.org/batteries-and-chargers/taking-care-of-lipos/  (see item [4] in the first post).

Basically you need to use a timer and stop, when you know you are at 80% of usage.  To figure out that 80%, see this :

http://www.rcindia.org/batteries-and-chargers/taking-care-of-lipos/msg6305/#msg6305
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« Reply #7 on: November 07, 2012, 11:02:06 PM »
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Thanks Anwar sir.
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