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Author Topic: Camera li-ion battery charger and battery as UPS  (Read 89 times)

WA2ISE

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Camera li-ion battery charger and battery as UPS
« on: March 30, 2020, 12:13:23 PM »

One of these camera battery chargers with its battery can function as a UPS to power an OpenWRT WRT54G router that has some files stored in its RAM. The charger is the only power source here, and its "FULL" LED indicator is lit, meaning the charger has switched itself from "CHARGE" mode (constant current) to "FULL" (constant voltage) mode.   The charger measures the battery voltage, and based on this,
it changes modes when the battery reaches the desired voltage. The router's current draw doesn't seem to confuse this function, as it's less than the current the battery draws in "charge" mode.   This is known as a parasitic load, and even though
this charger wasn't designed for this, it seems to deal with it fine.  This should be safe for the battery, as it doesn't see any other power source than the charger. 

I connected a DC power cord (to feed the router) to the terminals inside the charger, the ones that connect to the battery's + and - terminals. The battery (a Li-ion) doesn't seem to mind floating on the charger. It's been this way for over a year and the battery still holds a charge.

http://www.wa2ise.com/radios/ic-u2at-batterymod.htm#aa5
« Last Edit: March 30, 2020, 12:34:16 PM by WA2ISE »
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