Charging Safety Tips
• Never charge batteries unattended.
• Charge batteries in an isolated area away from flammable
• Never charge batteries inside a hot vehicle.
• Do not charge batteries while they are inside the aircraft.
• Follow battery manufacturer’s recommendations for
charge and discharge rates.
• When selecting the cell count or voltage for charging
purposes, select the cell count and voltage as it appears
on the battery label.
• Plug charge leads into the charger/DC power source one
at a time to avoid reverse polarity. Red is positive and
black is negative.
• Make sure the charge leads and the balance leads are
both plugged in during balance charging.
• Triple-check charge settings before starting the charge.
• Charge batteries at 1C to improve battery life.
• Do not attempt to charge any pack if the unloaded
individual cell voltages are less than 3.0 volts.
• Do not use or charge a damaged or “puffed” battery.
• Allow batteries to cool between charges.
Depending on the different connectors on your batteries, you may want a charge lead that
can support several, such as the one pictured, as opposed to a separate charge lead for each
used to connect the battery to your aircraft and to the
charger. This consists of a positive and negative wire with a
connector that is usually preinstalled on the battery when
purchased. Some batteries come without a connector,
allowing the end user to choose the connector. (To learn
more about connectors, see page 33 of the July 2015 issue of
Bullet connectors with one positive and one
negative lead are used to connect the charge lead
to the charger. On the other end could be a pair of
bare wires (requiring that a connector be installed), a
preinstalled connector, or multiple connectors.
Read the Instructions
Before using a charger or charging a battery for
the first time, thoroughly read the instructions. On a
charger with an LCD screen, take time to navigate the
menus and learn how to change the charge setting.
If the charger includes a USB connection, check
online or with the manufacturer to see if there are
any firmware or software updates. If so, follow the
manufacturer’s instructions and update the charger.
Visually inspect the charger to ensure that all of
the leads, connectors, fans, etc. are serviceable and
Thunder Power provides the following instructions
for steps to take before installing a connector or
charging a battery for the first time:
1. Make a visual inspection of the pack. Check for
any damaged leads, connectors, broken or cracked
shrink covering, puffiness, or other irregularities.
2. Before installing or changing the connector,
check the pack’s voltage using a digital voltmeter (not
your charger). All new packs ship at approximately
3. 8 volts to 3. 9 volts per cell. For example: A 2S pack
should read approximately 7. 6 volts
to 7. 8 volts; a 3S pack should read
approximately 11. 4 volts to 11. 7 volts.
3. If you find any damage to
the pack or leads, or the voltage is
significantly less for your pack than
specified, do not attempt to charge
or use the battery. Contact Thunder
Power [or your battery’s manufacturer]
directly as soon as possible.
If storing a LiPo battery longer than
one week, batteries should be stored at
3. 8 to 3. 9 volts per cell (approximately
50% charged). Storing a LiPo battery
fully charged can affect its capacity
loss over time.
A LiPo battery charged to 4. 2 volts
per cell and then left on the shelf at
room temperature will lose roughly
Many chargers on the market today have a built-in storage
47 Model Aviation SEP TEMBER 2015 www.ModelAviation.com