Redrum wrote: > ... > So, if these are to be believed, there is about a 50 ma draw @ "off with > clock" and <10ma draw at "press and hold off", 40ma difference > So, lets assume it's a 40ma difference, I think the battery is 2000maH, > that's only 50 hours, so something is wrong... > ... > I think the issue with the test is measuring the ac power to the adapter > rather than the DC in line with the battery. ... The Kill-A-Watt measures current at 120 Vac; however, the battery supplies about 12 Vdc. That is about a 10:1 difference, so the 50 mA @120 Vac drawn in "standby" would be about 500 mA at 12 Vdc.
It might be better to use the power (Watts) directly, or at least to calculate the current at 12 V. Using current: "4.3 @ 75% volume," 4.3 W / 12 V is ~358 mA from the battery, while standby 3.5V / 12V is ~291 mA. 2000 mAh / ~291 mA gives only ~6.87 hours of standby. I believe the radio shuts off completely after a fairly short idle period. When playing "@ 75%," 2000 mAh / 358 mA yields 5.58 hours of playing, reasonable. These figures just ballpark because they don't consider the loss in the power supply and charging circuit, to what extent the battery is fully charged using the charger, and the battery condition. (Using a direct wattage calculation: the 12 Volt 2000 mAh battery supplies (2x12) 24 Watt-hours (Wh). 24 Wh / 3.5 W = 6.85 hours standby, identical within rounding.) To the OP's point: manually shutting down the radio after playing for 20-30 minutes saves 15 minutes of battery power drain, and sounds like a good idea especially if recharging only once per week. ------------------------------------------------------------------------ POMdev's Profile: http://forums.slimdevices.com/member.php?userid=70558 View this thread: http://forums.slimdevices.com/showthread.php?t=116234 _______________________________________________ Radio mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/radio
