General Operating Information - GRAUPNER LIPO-QUICK-CHARGER 4 Operating Manual

General Operating Information

fast-charge batteries. For example, if there is a
brief interruption due to an intermittent contact,
the result is inevitably a malfunction such as a
restart of the charge process or an incorrect cell
count detection, which would result in the pack
being massively overcharged.
Charging batteries
During the charge process a particular quantity of
energy is fed into the battery; the Li-Po Charger
4 automatically calculates the correct quantity to
suit the battery connected to it, and adjusts the
charge rate during the entire charge process to
suit the battery's condition.
The maximum charge current of the Li-Po Char-
ger 4 is 5 Amps.
• Batteries must be supervised when on charge.
• Batteries must ALWAYS be placed on a fire-
proof surface for charging.
• Faulty or swollen Lithium cells must never be
recharged.
• The battery to be charged must be connec
ted using the original connector supplied with
GRAUPNER Lithium-Polymer cells.
• Ensure that there are no intermittent contacts
at any point in the charge circuit. If there
is a brief interruption due to an intermittent
contact, the result could be a restart of the
charge process, which would result in the
pack being massively overcharged.
Lithium-Polymer cells
The Li-Po Charger 4 is designed solely for char-
ging Lithium-Polymer batteries with a nominal
cell voltage of 3.7 V per cell. The outstanding
feature of Lithium batteries compared to other
battery types is their much higher capacity.
However, this important advantage is balanced
by increased risks, and it is necessary to adopt
different charging and discharging methods in
order to reduce the risk to a minimum.
It is essential to observe the basic instructions
provided here at all times. Please be sure also
to read the information and safety notes provid-
ed by the battery manufacturer, and keep within
the stated technical limits. The basic rule is that
Lithium-based batteries can ONLY be charged
using special battery chargers designed and
adjusted to suit the specific battery type (final
charge voltage and capacity). In contrast to NiCd
and NiMH batteries, Lithium batteries have to
be charged using what is known as a constant
current / constant voltage method. The charge
current required is determined by the battery ca-
pacity, and the charger detects and sets this au-
tomatically. Lithium batteries are usually charged
at a charge current of 1 - 2 C, where a charge
current of 1 C corresponds to the cell capacity.
For example, if a battery has a capacity of 1500
mAh, a charge current of 1 C is 1500 mA, or 1.5
A. The Li-Po Charger 4 automatically calculates
the optimum charge current to suit the battery
connected to it, up to a maximum of 5 amps. This
makes it unnecessary to set the charge rate, and
the charger therefore features no such means of
adjustment. Once the specific final charge volta-
ge for the particular battery type is reached, the
charger automatically reduces the current in or-
der to prevent the final charge voltage exceeding
the permissible maximum value.
Liability Exclusion
As manufacturers, we at GRAUPNER are not in
a position to ensure that you observe the correct
methods of operation when installing, using and
maintaining this charger. For this reason we are
obliged to deny all liability for loss, damage or
costs which are incurred due to the incompetent
or incorrect use and operation of our products,
or which are connected with such operation in
any way.
Components and accessories
As manufacturer GRAUPNER GmbH & Co. KG
recommends to use components and accesso-
ries which have been released by GRAUPNER
after checking them for suitability, function, and
security. GRAUPNER assumes responsibility for
these products for you. GRAUPNER does not
assume responsibility for components or acces-
sories which are not released or are produced
by a different manufacturer. Also, GRAUPNER is
not able to judge in every case if a product from
a different manufacturer can be used without se-
curity risk.
Operating Information 7