Multiplex POWER PEAK-UNI7 EQ Notice D'utilisation page 13

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LEAD-ACID BATTERIES (Pb)
• Gassing may occur when lead-acid batteries are being charged. Ensure that ventilation
is adequate. If overcharged, these batteries generate a mixture of hydrogen and oxygen
which is potentially explosive.
Explosion risk
• A charged lead-acid battery is by no means a child's plaything. Always store batteries
well out of the reach of children.
• Lead-acid batteries must never come into contact with open flames: explosion risk.
• Never forcibly open a lead-acid battery: chemical burn risk.
• Lead-gel batteries as widely used in modelling are usually of gas-tight construction, and
are less hazardous for this reason.
• In contrast, car batteries with fluid sulphuric acid electrolyte are very dangerous, both due
to the corrosive sulphuric acid and the rapid build-up of gas when overcharged.
• Never short-circuit a lead-acid battery: risk of fire and explosion.
• Never allow escaped electrolyte to contact your skin or eyes. If this should happen acci-
dentally, wash the area immediately with plenty of water, and seek medical attention.
Never place cells or batteries in your mouth, as they contain poisonous materials.
• Be sure to observe the battery manufacturer's recommendations when charging and
discharging batteries.
LITHIUM BATTERIES (LiPo, LiIo, LiFe)
INTRODUCTION
Different types of lithium battery are available:
1. Lithium-Ion batteries with fluid electrolyte and a nominal voltage of 3.6 Volt : the first
generation of Lithium battery, rarely encountered in modelling.
2. Lithium-ion batteries (LiIo) with fluid electrolyte and a nominal voltage of 3.6 Volt: the
second generation of lithium battery, with metal casing.
3. Lithium-Ion-Polymer batteries (LiPo) with gel electrolyte and a nominal voltage of 3.7 Volt
: the current generation of lithium battery, also known as LiPo. Pressure in the cell during
charge and discharge processes is lower due to the gel electrolyte, which means that a
foil casing is adequate. This type of battery has quickly become established for model
applications due to its low weight and high energy density.
4. Lithium-Ferrum batteries (LiFe) with a nominal voltage of 3.3 Volt: the latest generation
of lithium battery, also known as A123 cells. This battery is likely to become popular in
modelling due to its ability to deliver high peak currents and high energy density.
CAPACITY DIFFERENCES
When several cells are combined to form a battery pack and discharged at a relatively high
current,
the cells heat up at different rates, as heat from the inner cell is unable to dissipate.
This causes changes to the cell's internal resistance, and reduces its output capacity. As a
result this cell is discharged earlier, and there is a risk that it may be discharged below the
cut-off voltage of 2.5 Volt.
Major differences in capacity can occur, particularly when outdoor temperatures are very
Operating Instructions
Power Peak® UNI 7
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# 30 8564