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User Manual
26
MODSTER Mini Dasher
www.modster.at
- Do not charge with reverse polarity.
- Do not solder directly to the battery.
- Do not modify or open battery.
- Do not charge batteries above 4.2 volts (+/-0.05V) per cell and do not discharge below 3 volts per cell.
- Charge batteries only with suitable lithium battery chargers with connected or built-in equalizer/balancer, never connect
directly to a power supply.
- Do not use the battery in locations subject to high static discharge.
- All this can cause the battery to be damaged, explode or catch fire.
- Never charge batteries unattended!
- Never charge, store or keep the battery in the model or inside a car.
Charging procedure
Only use chargers that have been expressly approved by the manufacturer for use with lithium batteries. Lithium batteries
can only be charged using the CC-CV charging procedure. Make sure that the charger is correctly selected. In the first char-
ging phase, the charger keeps the charging current constant. With a charging current of 1C and a discharged battery, this first
phase takes approx. 50- 60 minutes. A battery capacity of approx. 80-90% is charged. When the end-of-charge voltage of 4.2
volts/cell is reached, only the voltage is kept constant and the charge current drops. A further 35-40 minutes are required to
charge the remaining capacity. If the value reaches the lower current limit of approx. 5-10% of the specified charging current,
the charging process is switched off by the charging device. At a charge rate of 1C, this means that the entire charging pro-
cess takes approx. 90 minutes when the battery is discharged. A lower charging current of 0.3-0.5 C is recommended for the
first charging process. This measure facilitates balancing and increases the service life of the battery.
Voltage sensor cable
Due to different cell temperatures during the discharge process, the individual cells gradually acquire different charge states
and voltage levels. The total charge voltage applied is then not distributed evenly across the individual cells, which means
that cells with a higher voltage level can be overcharged.To measure the individual cell voltage, the lithium batteries have a
separate plug connection (voltage sensor cable), from which a cable leads to each individual cell.The black cable (Pin1) is the
negative terminal of the first cell, Pin2 the positive terminal. The next contact in each case is the respective positive pole of the
subsequent cell.
Connect the voltage sensor cable to the Equalizer/Balancer connector on the charger for charging, which conveniently and
automatically brings all cells to the same voltage value at the same time.
In addition, the voltage of each individual cell is monitored.
Technical data:
Rated voltage: 3.7 volts/cell
Low charge rates protect the battery,
high charge rates reduce the number of cycles by approx. 10%.
End-of-charge voltage: 4.2 volts/cell (to be maintained to within 0.05 volts)
Discharge rate / discharge current:
Depending on battery type, e.g. a 25C battery can be discharged at a constant rate of 25C (25 times the rated capacity in Ah),
and for a short time (for 3 seconds) up to 50C (twice the constant discharge rate). Examples:
25C (discharge rate), means capacity value x C rate = discharge current.
25C-battery with 1000mAh (1Ah) x 25C = 25A discharge current continuous/50A short time
30C battery with 1000mAh (1Ah) x 30C = 30A discharge current duration/60A short-term
45C battery with 1000mAh (1Ah) x 45C = 45A discharge current duration/90A short-term
End of discharge voltage:
Lithium cells should be disconnected under load, at the latest at about 3 volts /cell. If the voltage falls below the limit, the cell
may be destroyed, explode and start to burn.
Maximum temperatures
Charging: +45°C, disch60°C
Temperature behavior
Lithium cells have a distinct temperature curve.
At temperatures below 10...15°C the removable capacity is significantly lower than at 20...35°C. Even at higher temperatures
(above 35...40°C) the removable capacity is noticeably lower.
The maximum external cell temperature should not be exceeded during both charging and discharging, otherwise the cell
will suffer permanent damage in the form of capacity loss. If exceeded for a longer period of time, it will be destroyed and may
explode and start to burn.