Boeing’s original 787 battery testing pointed to overcharging as main concern | Components content from ATWOnline

Extensive testing on lithium ion batteries
during the 787 certification process led
Boeing to believe that "significant
overcharging" was the only occurrence that
would cause the batteries to vent fire,
according to a senior Boeing executive.
Testifying Tuesday in Washington DC at a
US National Transportation Safety Board
(NTSB) hearing, Boeing VP and 787 chief
project engineer Mike Sinnett said testing
done in 2006 and 2007 "used what was the
state of the art at the time" to determine
what could potentially cause the battery to
fail and vent fire. Using a "nail penetration
test" to intentionally cause damage to the
lithium ion battery, "the only time we were
able to make a [battery] cell vent with fire
was significant overcharging," Sinnett said

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