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USER MANUAL
LRP RX/TX - LIPO LINE
3.7V/ 7.4V / 11.1V TX/RX LIPO HUMP AND STRAIGHT PACKS
DEAR CUSTOMER,
thank you for your trust in this LRP product. By purchasing a LRP VTEC RX/TX-only LiPo pack, you have chosen a
high-performance battery for your RC model. Please read the following instructions to ensure, that your LRP VTEC RX/
TX-only LiPo pack always works up to your full satisfaction.
LiPo-batteries need special treatment and care. Please read the following instructions carefully before you start using
your LRP VTEC RX/TX-only LiPo pack. This user guide contains important notes for the installation, the safety, the use
and the maintenance of this product. Thus protecting yourself and avoid damages of the product.
Proceed according to the user guide in order to understand your LRP VTEC RX/TX-only LiPo pack better. Please take
your time as you will have much more joy with your product if you know it exactly.
This user manual shall be kept in a safe place. If another customer is using this product, this manual has to be
handed out together with it.
1. CONNECTIONS
All LRP VTEC RX/TX-only LiPo Packs are already equipped with the appropriate power plugs for connecting them to
your receiver or transmitter.
In addition to the power connectors, you will also find so called balancer connectors at you LiPo-packs. Those
connectors comply with the XHR - standard and have a three-core cable on any 2S LiPo-pack and a four-core cable
on any 3S LiPo-pack. Those connectors are used for balancing the single cells of a battery pack to an equal voltage
level. For standard operation on the transmitter or receiver the balancer is not necessary. Nevertheless, it must not
be cut or removed by any means.
Special balancers or certain chargers use this balancing port to perfectly condition and equalize the individual cells
inside the pack. Please check the user manual of the balancer/charger in order to know how the battery needs to
be hooked up. For perfect charging and conditioning of the batteries, we recommend our LRP PULSAR TOUCH
COMPETITION (No. 41555).
Note: The Balancing-port shall not be used for the standard use in the model/device. Only use the 4mm gold plug
sockets to power your model/device.
Balancing-port (2S - 7.4V packs)
Black (battery-) = cell 1-
Brown (cell conn.) = cell 1+ (cell 2-)
Red (battery+) = cell 2+
2. CHARGE
For charging the LRP VTEC Competition Car Line Hardcase LiPo batteries, we recommend our LRP PULSAR
TOUCH COMPETITION (No. 41555).
All LRP VTEC RX/TX-only LiPo packs can be charged with a current of up to 1C*. For charging, only use chargers,
which are specially designed and developed for LiPo-batteries. These chargers charge the battery with the max.
current till the battery reaches the max. charging voltage. The charger then reduces the charging current until the
battery is fully charged. This charging method is called CC/CV (Constant Current/Constant Voltage).
ATTENTION: Under no circumstances use NiMH/NiCd-chargers or chargers, that are set to NiMH/NiCd mode,
for charging LiPo-batteries! These chargers do not reduce the charging current and therefore ultimately lead to
overcharging the battery!
LRP VTEC RX/TX-only LiPo packs batteries do not heat up during charging. It is normal, that the battery still has
ambient temperature when it is fully charged. If the battery heats up during charging or warps, immediately stop
charging it. A Balancer which monitors the voltage of each single cell is mandatory during the charge of LiPo
batteries.
ATTENTION: Never charge your LiPo battery without a balancer directly connected to the balancing port of your
battery, unless your charger is already equipped with a balancer.
The maximum charging voltage for each single LiPo-cell is 4.20V. If the battery reaches this voltage, the charge
current has to be lowered. This is automatically done by the charger. If the charge current reaches 0.05 - 0.1C*,
the battery is fully charged. Some LRP VTEC RX/TX-only LiPo packs batteries consist of multiple LiPo-cells. You
can see the max. charging voltage in the table below. We advise the following settings for charging our LRP VTEC
RX/TX-only LiPo packs batteries:
Cell configuration
LRP RX/TX-only LiPo - 1S - 3.7V
LRP VTEC RX/TX-only LiPo - 2S - 7.4V
LRP VTEC RX/TX-only LiPo - 3S - 11.1V
Please note: You can use your LRP VTEC RX/TX-only LiPo pack several times a day. However be sure, that the
battery has completely cooled down to ambient temperature, before re-charging it again.
LRP VTEC RX/TX-only LiPo packs batteries do not have a memory effect and only a very low self-discharge rate.
Therefore you can also charge batteries with a partial charge in them, without the need of discharging the pack
before. Partially charged packs can be stored over a long period of time, without getting damaged. Please also
see the „Storage" section for further reference.
*C=Nominal capacity of the battery. E.g. with a nominal capacity of 2000 mAh (2.0Ah), the battery can be charged
with a max. current of 2.0A.
3. USE OF RX-ONLY PACKS WITH RECEIVERS
Due to the nominal voltage of 7.4V, LiPo RX-only packs must not be directly connected to your receiver. Standard
receivers and servos are both operating with 6V, so either use our LRP LiPo RX Regulator (No. 45000) or the LRP
Heavy-Duty BEC (No. 45010) to connect the LiPo to your receiver. Those regulators reduce the voltage to 6V and are
interconnected between your receiver and the LiPo RX-only pack. For further details, please see the manual of the
regulator.
4. DISCHARGING
You have to take care, that the batteries do not get deep discharged. As soon as the battery voltage falls below 3.30V
per single cell, the battery pack gets damaged irrevocably. With 2S packs, the discharge cut-off voltage under load is
6.6V. The battery voltage should never fall below these discharge cut-off voltages. When using a TX-only pack in your
transmitter, be sure to check the voltage indicator of your TX from time to time. Tthe voltage of your RX-only pack
should be checked after every longer ride and be recharged it if necessary.
IMPORTANT: The max. temperature of the LiPo-battery during discharge must never exceed 65°C (150°F).
Note: If the batteries do swell or get thick after discharging them, it is a sign of overload and/or deep-discharge.
The battery pack gets damaged due to this and the max. performance will get less. Swollen battery packs are not a
product fault and therefore excluded from the limited warranty.
AA00671 © LRP electronic GmbH 2016
Balancing-port 4-polig (3S - 11.1V packs)
Black (battery-)
= cell 1-
Brown (cell connection 1)
= cell 1+ (cell 2-)
Blau (cell connection 2)
= cell 2+ (cell 3-)
Red (battery+) = cell 3+
max. charge current
max. charging voltage
1C*
4.20V
1C*
8.40V
1C*
12.60V
LIPO TECHNOLOGY
HIGH POWER
HIGH CAPACITY
5. SPECIAL NOTES FOR HANDLING
• Avoid short-circuits! Short-circuiting the battery results in very high currents, which damage the internal structure
of a LiPo-battery. This leads to a loss of power and capacity.
• Never charge LiPo batteries without a balancer. Charging without a balancer can damage the battery. Please note,
that your limited warranty will void if you charge without balancer.
• Be sure, not to damage the outside of the LiPo-battery. The battery is only protected by a heatshrink. The actual
Lipo-cell is directly under this heatshrink. If the outer skin of the cell gets damaged, the battery can no longer be
used. Therefore take special care, that no sharp objects like knifes, tools, carbon fibre edges or similar items can
damage the LiPo-pack's hull or the cells within it.
• When securing the LiPo-battery inside your model/device, you have to take care that the LiPo-battery does not get
damaged or warped in case of a crash. LiPo-batteries are less mechanical resistant then NiMH-batteries in a metal
can. Therfore pay special attention that the LiPo-battery does not get damaged or warped by letting it fall down,
hitting it, bending it or by similar actions.
• Never charge several LiPo-battery packs at once with one charger. The different capacities and charge levels can
lead to serious overcharging of the battery, even if you are using a charger with LiPo capabilities.
• Damaged packs cannot be used any longer. If the packs show signs of damage, are bent or similar, do not use the
packs anymore.
• The chemical reaction during charging and discharging a LiPo-battery is not fully reversible. Due to that, LiPo
batteries lose capacity during their life-span. This is normal and neither a manufacturing nor production fault.
Disposal note: Damaged packs or packs, which can no longer be used are hazardous waste and have to be disposed
of accordingly.
6. STORAGE
LRP VTEC RX/TX-only LiPo packs do not have a memory effect and only a very low self-discharge rate. Therefore these
batteries can be stored over a longer period of time without special treatment. You only have to take care, that the
batteries do not get stored completely empty.
For a storage over a longer period of time, we recommend to charge the battery up to 50% of the nominal capacity.
Therefore fully discharge the battery pack and then partially charge it with a charge current of 1C for 30 minutes or
charge it up to a voltage of 3.85-3.90V/cell. In this condition, the battery can be stored at least half a year at 25°C room
temperature without the need of recharging it.
For a storage over a short period of time, you also have to pay attention, that the battery is partially charged. Never
store the battery completely empty.
Even if you are using your battery regularly every week, always pay attention that the battery is partially charged with
at least 30% of the nominal capacity during storage. A partial charge with 1C charge current for 20 minutes is sufficient
in this case, if the battery was competely empty before.
If you pay attention to the above mentioned notes, you can enjoy your LRP VTEC RX/TX-only LiPo packs for a very
long time.
7. INTERESTING FACTS ABOUT LIPO BATTERIES
• LiPo batteries shall only be charged at a temperature between 0-45°C. If this will not be observed, the cycle life of the
battery will be reduced drastically.
• The single cell open circuit voltage of a fully charged LiPo battery is 4.2V. The single cell open circuit voltage of a 50%
partial charged LiPo battery is approx. 3.85V. The single cell open circuit voltage of an empty LiPo battery is approx.
3.3V.
• A voltage below 3.3V per cell without load is in either case harmful for a LiPo battery. Therefore always avoid voltages
below 3.3V per cell.
• It is not visible from the outside when a LiPo battery gets overcharged. The only way to find this out is to measure the
voltage of the LiPo battery. The battery does not heat up nor does it swell when it gets overcharged. Therefore always
check the battery voltage during charging. If it exceeds the max. charging voltage stop the charging process immedia-
tely and check all settings.
• We recommend to stop discharging a Lipo battery if the remaining capacity reaches 30% of the nominal capacity.
With this, LiPo batteries will have the max. possible cycle life. Real-Life application showed, that the cycle life of LiPo
batteries is reduced if the battery always gets completely discharged. This phenomenon can be seen with all types of
LiPo batteries.
REPAIR PROCEDURES / LIMITED WARRANTY
All products from LRP electronic GmbH (hereinafter called "LRP") are manufactured according to the highest
quality standards. LRP guarantees this product to be free from defects in materials or workmanship for 90 days
(non-european countris only) from the original date of purchase verified by sales receipt. This limited warranty
doesn´t cover defects, which are a result of misuse, improper maintenance, outside interference or mechanical
damage.
This especially applies on already used batteries or batteries, which show signs of heavy usage. Damages or
output losses due to improper handling and/or overload are not a product fault. Signs of wear (loss of capacity)
after intensive usage are also no product fault.
The following points do also result in a service fee: Original power plugs replaced with a NON reverse polarity
protected power plug system (Stickpacks). Use of a non reverse polarity protected power plug system (Competi-
tion batteries). Send in the battery without power plugs. Removed or damaged original heatshrink.
To eliminate all other possibilities or improper handling, first check all other components in your model and the
trouble shooting guide, if available, before you send in this product for repair. If products are sent in for repair,
which do operate perfectly, we have to charge a service fee according to our pricelist.
With sending in this product, the customer has to advise LRP if the product should be repaired in either case.
If there is neither a warranty nor guarantee claim, the inspection of the product and the repairs, if necessary, in
either case will be charged with a fee at the customers expense according to our price list. A proof of purchase
including date of purchase needs to be included. Otherwise, no warranty can be granted. For quick repair- and
return service, add your address and detailed description of the malfunction.
If LRP no longer manufactures a returned defective product and we are unable to service it, we shall provide you
with a product that has at least the same value from one of the successor series.
The specifications like weight, size and others should be seen as guide values. Due to ongoing technical impro-
vements, which are done in the interest of the product, LRP does not take any responsibility for the accuracy of
these specs.
LRP-Distributor-Service:
• check www.lrp.cc
Das Symbol mit der durchgestrichenenen Mülltonnen bedeutet, dass innerhalb der eurpäischen Union die-
ses Produkt am Ende seines Produkt Lebenszyklus getrennt entsorgt werden muss. Dieses Produkt darf
nicht mit dem normalen Hausmüll entsorgt werden.
LRP electronic GmbH
Hanfwiesenstraße 15
73614 Schorndorf
Deutschland
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