Cadex C7200, User Manual, Page: 7 / 176

Safety Notices
Charging and Discharging Lithium-ion (Li-ion) Batteries
Lithium-ion (Li-ion) batteries are safe when used as directed. Battery safety cannot
be assured when a battery pack is built with individual cells of an unknown nature
with a serial and parallel connection. Not all Li-ion cells are suited for multi-cell
packs. Only cells that meet tight voltage and capacity tolerances can be used for
serial and parallel connection. Mismatched packs are subject to overcharge
resulting in venting with flame and fire. Check with the cell manufacturer to see if
the cells are suitable for multi-cell packs.
In the past, single Li-ion cells were only available to authorized battery
manufacturers. Today, imports are becoming readily available and often fall into the
hands of the inexperienced. While most brand name cells are equipped with an
internal cell disconnect that permanently opens the current path on high pressure,
some brands do not provide this safeguard. Many brands don’t’ use a separator
that shuts down the battery when high temperatures are reached. The internal
safety features are omitted for cost reasons.
Please follow the following guidelines when charging and
discharging lithium-ion cell(s) and packs. Failing to follow these
rules could result in venting with flame, explosion, fire and
personal injury.
Never connect cells in parallel and/or series that are not designed for that
purpose. A cell mismatch may overcharge and vent with flames.
Never charge or discharge the battery without connecting a working protection
circuit. Each cell must be monitored individually and the current disconnected if
an anomaly occurs.
Never leave the battery unattended while under charge or discharge.
Always attach a temperature sensor when charging and discharging the
battery. The temperature sensor must disconnect the current on excess
temperature.
Only connect cells that are matched and have the identical state-of-charge.
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