Here is a YouTube Video that explains Lipo's
https://www.youtube.com/watch?v=ZJHlJYDJohc
"c" rating is the current rating draw from Lipo batteries, NOT the Max Charge
rating. When it say's "25 C" on a 900 ma battery. 1C will last 1 hour at 900ma
draw , 2C will last 30min, 4C will last 15min and 25 C is very short in time.
Charging at 1C is the best rate to charge Lipo's, but you can charge at a
little higher rate if you need to get it up and use again. I would not go over
5C it's just not good for the Lipo's. The last thing you should know is you
should have a reading of 3.8 volts per cell if you are going to store the
batteries till the next time you plan to use them.
Larry Taylor Electronics Tech Retired / RC guy / KF6JBG
From: tccrockets-bounce@xxxxxxxxxxxxx [mailto:tccrockets-bounce@xxxxxxxxxxxxx]
On Behalf Of Bob Feretich
Sent: Saturday, July 11, 2015 4:11 PM
To: tccrockets@xxxxxxxxxxxxx
Subject: [tccrockets] Re: battery for stratologger CF
The C rating on a battery indicates the maximum continuous current (both
charging and discharging) for which it is designed. The C rating is multiplied
by the milli-amp hour (mAh) capacity rating of the battery.
So...
A 900 mAh 10C battery can handle continuous current of 9 Amps. (9000 milli-amps)
A 900 mAh 25C battery can handle continuous current of 22.5 Amps.
Flight electronics use only about 100 milli-amps, so either of these batteries
can easily handle the load.
(R/C cars and copters use far more power.)
At low discharge rates, the capacity rating is quite accurate. So when draining
100 mA from a 900 mAh battery, a fully charged battery should last 9 hours.
(900 mAh / 100 mA = 9h). They last less long at higher discharge rates. Also,
you should stop and recharge a LiPo (or Li-Ion) at about 20% discharged. (So 9
h * 80% = 7.2 h). Over discharging a LiPo battery will permanently damage it.
So either the 10C or the 25C battery will work fine for flight electronics.
Since the 10C is typically cheaper, I'd go with that. (Often the higher C rated
batteries don't come with short circuit and over-charge/over-discharge
protection devices.)
Don't store fully charged LiPo batteries for long periods when they are fully
charged. They will create hydrogen gas and puff up. If when your LiPos puff up,
destroy them by soaking in salt water overnight. Then throw them out.
Discharged LiPo batteries are not hazardous waste.
Manufacturers store batteries at about half charge (3.85V per cell).
Regards,
Bob
On 7/11/2015 2:38 PM, David Robb wrote:
I've been thinking about moving to Lipo in my two stage ebays to get more
room....
How long do the v7.4v 25c or 10c last on your Stratologger? Do you get
several hours before discharged?
==================
David M. Robb
robbdm@xxxxxxxxxxx
----- Original Message -----
From: James Dougherty <mailto:jafrado@xxxxxxxxx> <jafrado@xxxxxxxxx>
To: TCC chat <mailto:tccrockets@xxxxxxxxxxxxx> <tccrockets@xxxxxxxxxxxxx>
Sent: Sat, 11 Jul 2015 18:19:57 -0000 (UTC)
Subject: [tccrockets] Re: battery for stratologger CF
Don't forget JST battery connectors, you can get hoards from China if you don't
mind waiting a week for shipping:
http://www.ebay.com/itm/10-Pairs-150mm-Male-Female-2-Pin-JST-Connector-Plug-for-RC-Lipo-Battery-Part-E0-/161479501111?pt=LH_DefaultDomain_0
<http://www.ebay.com/itm/10-Pairs-150mm-Male-Female-2-Pin-JST-Connector-Plug-for-RC-Lipo-Battery-Part-E0-/161479501111?pt=LH_DefaultDomain_0&hash=item2598eda537>
&hash=item2598eda537
The male end is on the battery, female is on the connector end. You can also
order locally from Fremont here:
http://www.batteryspace.com/connectoradaptorapairofbecmalefemaleconnectors6long22awg.aspx
Or I can bring you a few (I have bags of them)
On Sat, Jul 11, 2015 at 11:12 AM, James Dougherty <jafrado@xxxxxxxxx> wrote:
Stratalogger CF uses 4-16V, I've had good luck with the 7.4v LiPo's Bob F.
recommended and have since used them in all
my flights - no problems.
I use this LiPo battery -
https://www.all-battery.com/74volt-900mah25cli-polylipobatterypackforcx2helicopter.aspx
you can also get the 10C version which is a better deal:
https://www.all-battery.com/two74volt-900mah10chighrateli-polypackforbladecx.aspx
2 for the price of one!
Get the Featherweight mag switch -
http://www.shop.featherweightaltimeters.com/product.sc?productId=33
<http://www.shop.featherweightaltimeters.com/product.sc?productId=33&categoryId=2>
&categoryId=2
and this is the charger to get -
https://www.all-battery.com/TenergyBalanceCharger-01267.aspx
On Sat, Jul 11, 2015 at 11:01 AM, Ben Sandoval <yobenflstf@xxxxxxxxxxxxx> wrote:
Which battery are you using for your stratologger cf. I'm getting ready to
order a few batteries and I'm still on the fence. Appreciate your input.
