Airborne batteries

[Adam Glatt]

It depends.  I do with an electric plane because I have my main chargers 
going after every flying session, so I just charge the RX pack on 
channel 2 (Schulzes have 2 outputs). It is held in with velcro, so takes 
about 5 seconds to remove or install.
On my glow plane I leave it in.

Lithium polymer batteries are only damaged by temperatures above ~150F.  
I actually had my car tinted this spring to keep internal temperatures 
down, but it was because I was concerned about the fuselage, not the 
battery.  We never see over 90F ambient here.

-Adam

Anthony Romano wrote:
> Do you guys remove your li from the plane when charging like the AMA 
> recomends? What about temp if you leave your plane in the car?
>
> Anthony
>
>
>> From: Adam Glatt <adam.g at sasktel.net>
>> To: discussion at nsrca.org
>> Subject: Re: Airborne batteries
>> Date: Thu, 06 Oct 2005 13:34:37 -0600
>>
>> Lithium polymer has some advantages, but also some disadvantages.
>>
>> Pro
>> Extremely light: 1320mAh for 58g, 2000mAh for 80g
>> Choose your exact voltage by use of a regulator (20g more weight)
>> No self discharge. Charge today, fly next month with confidence
>>
>> Con
>> Battery can ignite in flames if you make a mistake.
>> Battery can be ruined if you leave your plane on.
>>
>> I'm not sure about cost.  parts.rctoys.com has these costs:
>> 5.1, 5.6, or 6.0 regulator for $21
>> 1320mAh battery for $33
>> regulator w/ fail safe switch w/ 2100mAh battery for $66
>>
>> I've been flying lithiums for three seasons now and will never go 
>> back, but I have a lot of experience with the technology. For someone 
>> new to lithiums, there is a lot of learning to do.
>>
>> For a charger, you can get a simply plug, push, and charge charger 
>> for $45.  I wouldn't go that route, though.  It is important to know 
>> how much capacity you use per flight so you know how many flights you 
>> can do on a charge.  To know need you need a charger with a display, 
>> like the Triton, Hyperion, Duratrax Ice...all in the $110-140 range.
>>
>> Adam Glatt
>>
>> Bob Richards wrote:
>>> Guys,
>>>  I'm needing to replace several nicad airborne packs for my radios 
>>> (as well as a couple of transmitter packs). I'm wondering what has 
>>> changed in the technology in the past 8 years.
>>>  NiMh packs had just hit the market about 10 years ago, and as I 
>>> recall it seemed that they did not stand up well to vibration - 
>>> several inflight failures being reported. Seemed they were ok for 
>>> transmitters. Has that changed?
>>>  I know Li-ion and Li-poly are now available, but what type of 
>>> charging apparatus am I looking at investing in? I also think I need 
>>> to use a regulator with these?
>>>  I don't presently have a fast field charger and would like to have 
>>> one, is there one that covers all the above bases?
>>>  Thanks in advance,
>>>  Bob Richards.
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