LiFePO4 Batteries for Radio Transmitters and Receivers
transmitter and receiver power packs today are made using
NiMH cells. Many users have noted the much higher
capacity or lighter weight of Lipo cells, but LiPo have
voltage "too high" (3.7V/cell) to work reliably with
transmitters, receivers, and servos.
But unlike LiPo, LiFePO4 cells (3.3V/cell)
can be an excellent replacement for NiMH on voltage basis.
And compared to high-capacity NiMH packs, the Hyperion G3
LifePO4 Radio batteries have these other advantages:
- More capacity per gram, meaning
lighter models in flight, and longer transmitter
- Almost no "self discharge", so your
radio is always ready to go even weeks after charging.
- Superior voltage performance under
load, so your servos perform with more consistent torque
- Faster charge time (as fast as 15
In addition, the LiFe chemistry is not subject to "thermal runaway"
fires, which can occur when LiPo are overcharged,
making LiFe a much safer alternative.
Hyperion - as well as other quality digital servos makers -
will be introducing "High Voltage" servo types which can
handle both LiFePO4 and LiPo voltages. However, unlike
LiPo, LiFePO4 can be stored in a
fully charged state, and discharged deeper, without damage
to the cells. So they are more "rugged" than LiPo, safer,
more convenient and a better choice overall.
In the LiFe pack photos, you can see a Hyperion-style
balance connector, and also a red connector with 3.5mm gold
plugs, and a "spare" connector set. The red connector
allows these packs to be charged at high rates. The
"spare" can be attached to your existing Radio plug, or used
to make a charge cable.
Or you can purchase
ready-made accessory cables such as shown below
HP-FG-CBL-2EHR is specifically made for radio
transmitters, such as JR 9x, which use this 2-pin plug type. Connect
this between your G3 transmitter pack, and the radio.
is made for radio transmitters which use the 3-pin "servo"
connectors, or can be used to power any standard receiver
using a G3 6.6V receiver pack.
is a Charge Cable, which allows the packs to be charged at
HP-FG-CON35-2P is two sets of 3.5mm connectors and
insulators, allowing you to make any needed cable.
RECEIVER PACK NOTES: (Est. release
date July 25 2009)
- Each pack can sustain the listed
max continuous current, and safely exceed it by 60%
for 20 seconds.
- Suggested max charge rate is 4C,
which delivers 12-18 minute charge times, typically.
- For larger models using the larger Rx
packs and many or high-power servos, we recommend wiring
the receiver for power with 16-18AWG silicone wire, and
installing the supplied spare 3.5mm gold plug set, to
match the Rx pack.
- See CAUTION at bottom of this page
about servo types
Transmitter Packs (Tx)
L x W x H (mm)
||89.5 x 49.8 x 13.6
||78.2 x 41.3 x 16.8
||95.0 x 30.3 x 27.1
TRANSMITTER PACK NOTES: (Est.
release date Sept 1 2009)
- Absolute Max charge rate is 4.8A, as
this is the rating of the PCM safety chips used inside
the packs. Still this is quite a high charge rate,
and allows recharge in 30-45 minutes, typically.
- The PCM device protects the pack from
over-voltage charging. It also allows the pack to
remain installed in the transmitter, and then be charged
with the standard NiCd or NiMH wall-charger which comes
with most transmitters.
(wall chargers up to 12V max for 3S packs, or 8V for 2S
is a replacement for any transmitter which uses 8-cell
NiMH in a "flat" arrangement
- HP-FG305-2080-2S is a replacement for CAR Tx (or any) which use
5-cell NiMH "flat" packs, such as Futaba 4PK Pistol grip Tx.
- HP-FG305-2100-3S is a replacement for any transmitter which uses
8-cell NiMH in a 2x2x2 "block" arrangement.
The Hyperion G3 packs come with
Hyperion-Style balance connectors. Hyperion EOS chargers can
be used without extra adapters. Other-brand chargers
may require purchase of an adapter to match Hyperion
- These packs are LiFePO4 chemistry.
Only charge them on quality chargers - such as Hyperion
EOS line - which have a dedicated charge routine for
LifePO4 cells. The only exception is the
Transmitter packs with PCM, which may be charged while
in the transmitter, using the standard wall charger
supplied by the Tx maker.
- NEVER attempt to charge damaged
- Read all cautions on product
packaging before using these packs.
SERVOS - Many servos on the market,
and particularly many of the lower-cost analog types, cannot
operate at the voltage supplied by these LiFe Receiver
packs. Attempting to use a servo rated for maximum of
6V or less WILL RESULT in reduced servo life, and may lead to in-flight failure. Any such failure is the
sole responsibility of the user.
All current Hyperion ATLAS Digital servos (except DS09 and
DS11 series) can accept the voltage supplied by the G3 LiFe
receiver packs. If servo loads are especially high,
such as with heli collective servos used in hard 3D, you may
see slightly reduced lifespan in trade for higher torque and
speed output. Hyperion will also soon be introducing a
High Voltage (HV) Digital servo series which are specifically
made for input voltage in the range of 6V to 7.4V. As
such, they will be able to accept anything from 5-cell NiMH
packs to 2S LIPO packs. (est. release Oct 1 2009).
In general, when using G3 Rx packs your servos should be of
high quality from trusted makers, and have specification
allowing up to 6.5V loaded input voltage.
If you have any concerns about the voltage rating of your
servos, you may choose to run a BEC unit, such as the 5V/6V
selectable Hyperion SBEC pictured at left (HP-TICOOL-BEC), in order to
regulate voltage down to suit your servos. This offers
greater safety compared to BEC units running off the main
flight pack because even if your main flight pack is
completely depleted in flight the radio and servos will
maintain power via the Rx pack.
Hyperion G3 LiFePO4 Radio Packs are guaranteed as follows:
Defects in materials and workmanship (solder joints, etc)
for one year from date of purchase.
Persistent imbalance of one cell of greater than 0.06V
compared to average of other cell(s) in the pack. Must be
reported within 3 months of date of purchase.
Hyperion G3 LiFePO4 Radio Packs are NOT guaranteed
for the following:
Physical Damage to the pack occurring after purchase
(impact, water/moisture/salt, etc)
Over-voltage charging, or other error by charger or user
setting of charger.
Use outside of specifications
Damage due to improper storage (very hot locations, etc)
Improper balance connections to charger
Returns without copy of Original Receipt
Returns without accompanying note stating the reason for
Your selling dealer is your first point of contact for
warranty issues. Please contact your dealer for advice BEFORE returning any
item. In many cases your dealer can help you solve a
problem without return. Return postage is the
responsibility of the user in all cases.
You MUST Submit copy of original receipt, and explanation of
the problem with the return.
Returned units should be examined by the Hyperion dealers
tech department within 10 days of arrival, maximum, and
contact made with the user to explain the findings.