[NSRCA-dist8] Battery checkers

Sat Aug 1 07:20:40 AKDT 2015

And they parallel charge.

On Sat, Aug 1, 2015 at 8:07 AM, Patrick Harris <harris7148 at gmail.com> wrote:

> Pretty much everyone around here uses or have changed over to Dean's.
>
> On Sat, Aug 1, 2015 at 7:18 AM, Gordon Anderson <gaa at owt.com> wrote:
>
>> I use 5.5mm bullet connectors everywhere except the arming plug, I use a
>> deans connector for the arming plug. I have been pretty happy with the
>> 5.5mm bullet connectors and the batteries I get from hobby king come with
>> the connectors installed.
>>
>> --G
>>
>>
>>
>>
>>
>> On Aug 1, 2015, at 6:38 AM, Lyle Laughery via NSRCA-dist8 <
>> nsrca-dist8 at lists.nsrca.org> wrote:
>>
>> Now that all of you have beat the wadding out of battery checking can you
>> help this soon to be electric flier,choose the best battery connectors
>> between the speed controller and battery .Castle 80 and 5000 battery?
>> On Jul 31, 2015 8:55 PM, "Patrick Harris via NSRCA-dist8" <
>> nsrca-dist8 at lists.nsrca.org> wrote:
>>
>>> Real men fly eight times....102....wuss!
>>>
>>> On Fri, Jul 31, 2015 at 8:43 PM, Karl Watts <karlwatt at sarmc.org> wrote:
>>>
>>>> Eight times!  You need counseling.  I flew 3 times, 102 degrees and
>>>> became more gusty.  Went home for a beer and we were out.
>>>>
>>>> Sent from my iPad
>>>>
>>>> On Jul 31, 2015, at 8:50 PM, Patrick Harris via NSRCA-dist8 <
>>>> nsrca-dist8 at lists.nsrca.org> wrote:
>>>>
>>>> I flew eight times today and my twisty thing in the front went round
>>>> and round and yes boys and girls, I am proud to say "I am an admitted
>>>> Parallel Charger." Can I get an AMEN!
>>>>
>>>> On Fri, Jul 31, 2015 at 5:58 PM, Gordon Anderson <gaa at owt.com> wrote:
>>>>
>>>>> Don't get me started on parallel charging!
>>>>>
>>>>> G
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>> On Jul 31, 2015, at 5:15 PM, Patrick Harris via NSRCA-dist8 <
>>>>> nsrca-dist8 at lists.nsrca.org> wrote:
>>>>>
>>>>> OMG...Jim...don't say "parallel charging' around Gordon....he'll have
>>>>> a fit! 😀
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Jul 31, 2015 at 3:59 PM, James Hiller <jnhiller at earthlink.net>
>>>>> wrote:
>>>>>
>>>>>> Tried to fly today 17 MPH 101 degrees, this is getting old.
>>>>>>
>>>>>> I use a free volt meter from HARBOR freight to check before flying to
>>>>>> insure I'm not installing a used pack.
>>>>>>
>>>>>> Before charging I check the voltage of each twin 5S pack to select
>>>>>> packs with nearly the same voltage - usually within 2/10 V before parallel
>>>>>> charging. I always charge at 1C. Takes about two beers to recharge a
>>>>>> day's usage.
>>>>>>
>>>>>> I monitor charge Mah, which is a total when parallel charging, that I
>>>>>> average to a single battery to get a feel for per flight consumption.
>>>>>>
>>>>>> Occasionally I'll charge individual batteries to try to negate the
>>>>>> affects of parallel charging.
>>>>>>
>>>>>> I've also noticed it takes longer to balance when the batteries are
>>>>>> getting tired and I'll check the IR for weak cells ( IR Spread ).
>>>>>>
>>>>>> I'm also not working the batteries very hard only gaining maybe 20
>>>>>> degrees over ambient.
>>>>>>
>>>>>> Jim
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> *From:* NSRCA-dist8 [mailto:nsrca-dist8-bounces at lists.nsrca.org] *On
>>>>>> Behalf Of *Patrick Harris via NSRCA-dist8
>>>>>> *Sent:* Friday, July 31, 2015 3:32 PM
>>>>>> *To:* Gordon Anderson
>>>>>> *Cc:* AK, ID, MT, OR, WA, WY
>>>>>> *Subject:* Re: [NSRCA-dist8] Battery checkers
>>>>>>
>>>>>>
>>>>>>
>>>>>> All very true. I pick up on average about 5 percent after my packs
>>>>>> set awhile. I find the checker I use to be pretty close, but always about 5
>>>>>> to 10 percent off what the true level based on what I actually put back
>>>>>> into them.
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Jul 31, 2015 at 3:25 PM, Gordon Anderson <gaa at owt.com> wrote:
>>>>>>
>>>>>> Karl,
>>>>>>
>>>>>>
>>>>>>
>>>>>> Here is my 2 cents worth....
>>>>>>
>>>>>> Predicting battery capacity from the open terminal voltage is not
>>>>>> very accurate, I believe that is where this capacity prediction is coming
>>>>>> from. I will bet if you let the batteries "rest" a few minutes after your
>>>>>> flight and then check them again the capacity values will change. Battery
>>>>>> chemistry is very non linear. I think the best predictor of battery health
>>>>>> is the internal resistance, a lot of chargers will calculate and display
>>>>>> this value. Keep an eye on trends, as the batteries age the internal
>>>>>> resistance will increase and they will also get hotter during the flight
>>>>>> and eventually start to puff up. The nice thing about monitoring IR is you
>>>>>> can see if a cell is getting significantly different than the rest of the
>>>>>> cells in the pack.
>>>>>>
>>>>>> The best way to know the capacity you have taken from the pack is to
>>>>>> use a data logger that is measuring voltage and current and then
>>>>>> calculating the maHr usage. Even in this case you will have to put more
>>>>>> back in than you took out, this is because of the IR that burns some up in
>>>>>> heat and the fact that the process is not linear.
>>>>>>
>>>>>>
>>>>>>
>>>>>> --Gordon
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Jul 31, 2015, at 12:11 PM, Karl Watts <karlwatt at sarmc.org> wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Do any of you guys or gals use battery checkers?  Are they reliable?
>>>>>> I have one that I use to check my batteries before and after I fly.  For my
>>>>>> flight packs – 2 5000 mAh packs it consistently reads 97-99% and after
>>>>>> flying 14-33%.  My confusion is when I take a pack that say reads 14% after
>>>>>> flying and charge it I am only putting in about 3000 mAh.  Seems to me the
>>>>>> battery checker should show 40% not 14%, I used 3000 mAh which is 60% of
>>>>>> the pack.  Should I discard the battery checker?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Karl
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
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