On 12/15/2012 3:44 PM, Peter Lambert wrote:
I charged the batteries again overnight. They were completely flat (8.2V)
when I started the 16 hour charge cycle. About 2 hours before the cycle was
due to finish the display showed "not0-40C". The ambient temperature was
27C, the PA 33C and the OSC 42C. It's about an hour later now and the
display still shows "not0-40C". Another 15 minutes later and the charge
cycle seems to have continued where it left off.
I guess my question is where is the temperature sensor used by the battery
charger ?. (ie is it on the KXBC3 board which would be quite close to the
batteries and this over temp indication really means batteries are in fact
fully charged and starting to self-heat or is using the OSC temp sensor
perhaps ?).
Hi Peter,
The temperature sensor is on the KXBC3 board and has pretty good thermal coupling to the
side contacting the batteries in about the middle of the pack. Charging will suspend when
the temp hits 45 degrees C and will resume when it drops below 40 C. With the specific
conditions you describe, it's pretty likely the batteries are fully charged (or very
close) when you get the "not0-40C" message.
73,
Rich AC7MA
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