Thread
:
Batteries make flashilight hot.
View Single Post
#
6
Posted to sci.electronics.repair
mike[_22_]
external usenet poster
Posts: 1,243
Batteries make flashilight hot.
On 2/23/2017 4:58 AM,
wrote:
On Wednesday, February 22, 2017 at 8:48:12 PM UTC-5, micky wrote:
I have one of thoe little 2.5" LED flashlights, that have 9 small LEDs
and use 3 AAA batteries. It's like the ones that Harbor Freight
sometimes gives away free, same size, but nicer.
The guy I bought the first one from said it would run for days on one
set of batteries, but I forgot that it was still on and i put it in my
pocket and an hour or two later, I noticed it was on because it was
warm.
It's still really bright, but if it's noticeably warm, how long can the
baterries really last? Certainly not two days. ?
I once, recently, forgot the screen was lit on my 5.5" smart phone and
only noticed because it felt warm in my pocket.
It's got a proximity sensor but I don't remember what it's supposed to
do.
The heat is from the LEDs, not the batteries, and no, the batteries will
not last indefinitely. I would guess (SWAG) that each LED will run about
50 ma.
So you are pulling 450 ma, or thereabout per hour. If your AAA batteries
are
middle-of-the-road 1,000 MAH, you have a base of 3000 MAH, so, about 6-7
hours
+/- or so. Under normal use, that is 'days'.
Peter Wieck
Melrose Park, PA
Might want to check that math.
Reply With Quote
mike[_22_]
View Public Profile
Find all posts by mike[_22_]