Caution: If hands under this red marked side, hands will get hurt.
Danger: when battery is connected together with the base the internal socket still
have high voltage DC power from serial connected battery modules (battery
module can't be turned off).
3.4.7 Installation of the metal bracket for the system
In control module's package has 2pcs short and 2pcs long
metal bracket s.
Fix these metal brackets at the both back side corners.
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