On Mar 18, 8:19*pm, Andy wrote:

Didn't measure the voltage applied to the cells,. *13.8 was the
voltage applied to the PowerFLARM Portable. *Well within its specified
range.

I made some measurements over the weekend. With 13.8 volts applied to
the portable the highest cell temperature I saw was 62 deg C. This
was immediately after removing the battery compartment cover. When
the cells were fully charged the temperature dropped to about 35 deg
C. Highest measured voltage across all cells was 9.2V but it was not
continuously monitored.

Cells were 2000mAh Lenmar. Probably not the highest quality cells
and not new. Temperature was measured with an uncalibrated IR spot
thermometer. Ambient temperature was about 25 deg C.

Version 1.00 of the manual says the case plastic was tested to 60 deg
C and will deform at 84 deg C or lower.

Your results may be different but the caution in the manual seems
justified - "When the unit is being charged never allow it to remain
unsupervised".

Andy