Nubo
Enlightened
- Joined
- Dec 23, 2004
- Messages
- 461
What's a reasonable limit for current draw from alkaline batteries?
One option I'm trying to design into my light is using 7 alkaline batteries with regulation to power a GH44 bulb at something like 6.6 volts. That bulb's specs are about 1.7a current. I'd imagine at first the batteries would be "seeing" about 1.25 amps demand as the "duty cycle" of the regulator, but then would ramp up to the full 1.7 amps as the light fell out of regulation.
On the ragged edge for alkalines? Or simply too much?
Would a 7-cell pack even be able to deliver these currents? I've seen references to alkalines' "high internal resistance", but don't know the specifics.
I'm trying to design this light to take AA of either NiMH, alkaline, or Lithium.
Does that 2nd option stand a chance?
One option I'm trying to design into my light is using 7 alkaline batteries with regulation to power a GH44 bulb at something like 6.6 volts. That bulb's specs are about 1.7a current. I'd imagine at first the batteries would be "seeing" about 1.25 amps demand as the "duty cycle" of the regulator, but then would ramp up to the full 1.7 amps as the light fell out of regulation.
On the ragged edge for alkalines? Or simply too much?
Would a 7-cell pack even be able to deliver these currents? I've seen references to alkalines' "high internal resistance", but don't know the specifics.
I'm trying to design this light to take AA of either NiMH, alkaline, or Lithium.
Does that 2nd option stand a chance?