I just made some obsevations regarding the charging current of my Vanson BC-1HU (speedy box) when charging AA cells. The maual says that the charging current is 500 mA, but my calculations show that it is about 700 mA. First I charged 2 Sony 700 mAh NiCd cells. It took 1h 8 min from flat. The discharge capacity at 550 mA load was close to 700 mAh. This is impossible to obtain at 500 mA charge current even if we assume 100% charging efficiency (1.13h x 500 mA =567 mA.
Same thing with Sanyo 1700 mAh cells. It took 2h 34 min and I could discharge ca 1600 mAh from them at 700 mA load.
It looks like despite the manual claim the charging current is 700 mA even for AA cells. This makes sense since the safety timer is reported to be set at 5 hours for AA cells. At 5 hours the new 2500 mAh cells will end up undercharged because the charging efficiency is less than 100%. I wonder if the engineers at Vanson didn't change their newer units to make sure they can handle the new high capacity cells. My unit is relatively new. Anybody else can comment?
Same thing with Sanyo 1700 mAh cells. It took 2h 34 min and I could discharge ca 1600 mAh from them at 700 mA load.
It looks like despite the manual claim the charging current is 700 mA even for AA cells. This makes sense since the safety timer is reported to be set at 5 hours for AA cells. At 5 hours the new 2500 mAh cells will end up undercharged because the charging efficiency is less than 100%. I wonder if the engineers at Vanson didn't change their newer units to make sure they can handle the new high capacity cells. My unit is relatively new. Anybody else can comment?
