[NSRCA-discussion] FW: ESVs for flight pack lipos?

[Ron Van Putte]

A friend was putting Lipos into his airplane and I noticed he took  
one of those plastic tags, like are used to seal of the ends of the  
bags covering loaves of bread, off the positive lead of the battery.   
I asked him what that was all about.  He explained that he put the  
tags on the battery leads after he'd charged the batteries.  If he  
didn't find a plastic tag, the battery wasn't charged.  That way he  
only needs one ammo can to keep Lipos in.

Ron VP

On Aug 29, 2008, at 11:33 AM, John Pavlick wrote:

> I use a really simple method to avoid this problem. I have 2 cases  
> for my batteries. One is the "charged and ready" case and the other  
> is the "I just flew these" case. Battereis come OUT of the charged  
> and ready case and go INTO the plane. When you land, the batteries  
> come OUT of the plane and go INTO the other case. The logic for  
> charging is opposite that of flying. As long as you don't put the  
> batteries in the wrong case, it works. You have to develop a habit  
> but it's not too difficult. Works for me and it costs nothing.
>
> John Pavlick
>
> --- On Fri, 8/29/08, James Oddino <joddino at socal.rr.com> wrote:
> From: James Oddino <joddino at socal.rr.com>
> Subject: Re: [NSRCA-discussion] FW: ESVs for flight pack lipos?
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Date: Friday, August 29, 2008, 4:22 PM
>
> Hi Gordon,
>
> I suspected that.  I was thinking of building a gadget that lit up  
> an LED if the voltage was over 41 or so.  It could be very  
> inexpensive and could save a set of expensive batteries.  I have  
> seen more than one guy take off with batteries they thought they  
> had charged.  They found out only when the voltage had dropped too  
> low.  I almost did it once but I had an Eagle Tree TM system and  
> checked the voltage before I took off.  I don't always use the ET  
> so it would be nice to have another painless way to know the packs  
> are charged.
>
> Jim
>
>
> On Aug 29, 2008, at 6:16 AM, Gordon Anderson wrote:
>
>> Jim,
>>
>> The maestro will not accept a 42 volt input. It was designed as a  
>> flight pack testing system and includes a programmable battery  
>> load. It will calculate and display the packs internal resistance  
>> as well.
>>
>> --Gordon
>>
>> From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca- 
>> discussion-bounces at lists.nsrca.org] On Behalf Of James Oddino
>> Sent: Thursday, August 28, 2008 4:18 PM
>> To: General pattern discussion
>> Subject: Re: [NSRCA-discussion] FW: ESVs for flight pack lipos?
>>
>> What is the voltage range?  I'd like to have a unit that would  
>> stay in the plane and tell me that my 42 volt battery is charged  
>> when I plug it in.
>>
>> Jim
>>
>>
>> On Aug 28, 2008, at 3:42 PM, Derek Koopowitz wrote:
>>
>>> I bought mine from Gordon Anderson...
>>>
>>> http://www.mstar2k.com/
>>>
>>> Look for the Maestro on his page.
>>>
>>> From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca- 
>>> discussion-bounces at lists.nsrca.org] On Behalf Of Richard Strickland
>>> Sent: Thursday, August 28, 2008 11:36 AM
>>> To: NSRCA DISCUSSION
>>> Subject: [NSRCA-discussion] FW: ESVs for flight pack lipos?
>>>
>>>
>>> I'm switching some of my stuff to 2 cell lipos into a regulator  
>>> (learned the hard way that you separate the regulator on the  
>>> OTHER side of the switch from the battery--but that's another  
>>> story).
>>> The question(s): What is a good, relatively small ESV that has a  
>>> load to check the lipos? What voltage do you let them get down to  
>>> before no go?
>>> My 30 year old SO (Ye Olde ESV) ranges just miss that middle  
>>> ground. I've got a voltmeter--but it's not loaded.  On a 1200 pack 
>>> (still lighter than 4 nicads WITH reg.) on four flights, the drop  
>>> was from 8.4 down to 8.25V.  I'm going to a 780 on another  
>>> airplane and my understanding guys are getting up to 7-8 flights  
>>> on that size pack.  But how do you check them?
>>>
>>> Thanks,
>>>
>>> Richard
>>>
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>>
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