misterv

Could someone advise if a pair of these batteries, in series would be a suitable replacemnt LiPo Tx.Aurora. pack.
SPIDERFIRE Li-ion. 2400mah. 3.7v.Rechargable. Size.each.Length 2.56" x .71" Diameter.
Price. US$7.50. Postage Free.

A.T.

Those batteries are an unknown item, please refer:

Aurora 9 - Battery Installed ex Factory is part #54128 "TX NiMH battery (6 cell) Pack (Flat Type) for AUR (RA9) 7.2v / 1300 MAh"(not an Eneloop 2000)...... Includes notes on Battery Compartment Size, Alternate Batteries and 2S Lipo Capabilities for Aurora & Optima RX.
Aurora 9 - Lipo User Adjustable Voltage sets Shut Down = TURNS TX OFF to save damage to Lipo Battery and/or TX
(Audible Battery Warning is still at 6.9V with Lipo which provides say 10-20 min before shutdown.)
Aurora 9 - Warning Alarms Battery types, voltage levels and consumption. CAUTION - Leave Auto Hibernation (was Auto Power Off prior to V1.06) as "Never" when using Lipo Battery. During "Auto Hibernation" (as with laptops) TX Does Not Switch everything Off and batteries will be completely drained if TX switch is not manually moved to the off position in good time. Remove battery and store separately if TX is to be unused for a period.

Aurora 9 - Lipo & Field Charging. includes Fast Charge Aurora, Eclipse 7, Flash 4&5, Laser, Optic 6, Prism 7 etc.


To recap on battery requirements/provisions from previous posts:
Aurora Transmitter Battery: Default is for a 7.2V Ni-Cd or Ni-MH. However, if you elect to change setting to Li-Po, you can modify the transmitter shut down voltage from 6.0V to 6.5V in 0.1V steps. [FWIW Known Li-Po manufacturers do not recommend allowing a cell to drop below 3 volts.] Alarm still sounds at 6.9v thus providing say 10-20 minutes before TX turns off to prevent damage to battery and/or transmitter.
. A123 pack cannot be used due to both size and the lower voltage
. LiFE battery cannot be used in the A9 because the voltage is too low. A 2 cell LiFE has a nominal voltage of 6.6 and a full charge voltage of 7.2. They usually drop to about 6.8v pretty quick so it will be under the low voltage alarm of 6.9v in just a few minutes.

ex Hitec USA Support Forum Sticky:
Aurora 9, Spectra Modules & Optima Transceivers - FAQ & Undocumented Features
- Mixes, Setups,Tips. {Individual Links often updated}

Alan T.
Alan's Hobby, Model & RC FAQ Web Links

misterv

I can only assume it is the unknown brand name that could be problem with these batteries in a Tx.
Aren't Li-ion supposedly the smart and safe lipo, universally used in laptops, cameras, phones and full size motor vehicles.?
For the Aurora the size is right with width 1 mm. to spare. Voltage right 7.4 volts with PCD protection on max. and min. cut out voltages.
Hitec does not oppose the use of Lipo's in their Tx. A Li-ion must be a better alternative.
There are plenty of Li-ion batteries of this size marketed in US under some known and some unknown brands. Probably still made in the Orient but at a higher price.
Most agree that the NiMah Tx.battery in the AUrora is at best, adequate. Would these "named brand" be acceptable as a Aurora Tx. battery.?