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andy ching
Hopping Maniac
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Joined: 21 Sep 2011
Posts: 42
Location: nz

PostPosted: Fri Oct 07, 2011 9:16 am
PostPost subject: New Batteries
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Hey ya'll just got some new batteries blue lipos and they are 1300 mah 15 C 7.4v. The detrum dc6 beeps when i try to charge at 1.3 amps is this ampage right? Its a 2 cell battery . Whats the safest and or best amps setting for these batteries . Cheers Confused
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nick_onelove
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Joined: 01 May 2011
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Location: Mendocino County, CA, United States 21 years old

PostPosted: Fri Oct 07, 2011 10:47 am
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You got it; for a 1300mAh battery, charging it at 1.3A is 1C.

Are you saying it's not letting you charge it? Did you switch the voltage to 7.4V?
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andy ching
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Joined: 21 Sep 2011
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Location: nz

PostPosted: Fri Oct 07, 2011 6:06 pm
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nick_onelove wrote:
You got it; for a 1300mAh battery, charging it at 1.3A is 1C.

Are you saying it's not letting you charge it? Did you switch the voltage to 7.4V?


Yeah pretty sure it was on 7.4 v as i'm keen on getting it right,so set voltage and 2s for 2x cells, couldnt see how to set the 15C rate. it charges on normal but not at 1.3 amp on 0.1 , 0.2 ... etc up until 1.0 and above, and at 1.3 alarms on both fast and normal charge. Must be just something i,ve overlooked , manual on mini disc which i can't see, have the download one tho and will go back to that. Cheers for your imput Smile
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andy ching
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Joined: 21 Sep 2011
Posts: 42
Location: nz

PostPosted: Fri Oct 07, 2011 7:29 pm
PostPost subject: Voltage check
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So i tried again and i think its because they arrived fully charged as each battery tested upwards of 7.4 Volts, could this be why they not charging at 1.3 amps? Cool
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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Sat Oct 08, 2011 12:11 am
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Hi Andy,

Your 2 cell battery has cells which at storeage level are 3.8V each = 7.6V.
Fully charged the cells are at 4.2V each = 8.4V.
Discharged to the safe level of 3.2V each cell = 6.4V.
(Don't even think of going below 3V/cell you'll ruin the battery!)

The 7.4V is only a nominal reference, your batteries will very rarely be at that voltage for long.

It is quite normal for chargers to reduce the current towards the end of a charge. The cell voltage rises with current and a full charge to 4.2V can only be acomplished with a very slow trickle to minimise the rise in volts. You may find the the charger even stops charging for a moment to check the zero current voltage level.

Your asking very sensible questions here on a very vital topic. Good on yah! Wink

Tom.
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Skyepuncher
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Joined: 29 Aug 2011
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Location: south-central Ohio

PostPosted: Sat Oct 08, 2011 2:10 am
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Good post Tom.
Andy, I have had good luck with Blue-Lipos, & will buy
more when needed. Priced rite.
Scott
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andy ching
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Joined: 21 Sep 2011
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Location: nz

PostPosted: Sat Oct 08, 2011 7:28 am
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Thanks everyone, and have discovered the power source is the problem it comes up with INPUT VOL ERR , meaning power source too low !! Just test flew one of the blue lipos very nice better power than the Li/Fe . Cheers andy.
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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Mon Oct 10, 2011 12:42 am
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Glad you got it sorted Andy.

Tom.
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