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Hi Damien, I have a PDF of the manual, and it states that running off
rechargeables is not recommended as 3 fully charged rechargeable AAs only
just supply the minimum required voltage [3.6v], so I always have used 3 normal AAs. The port is definitely for an external power source, it is listed as such.
You have the wrong end of the stick; It is the hand controller [ actually its motherboard] that gets hot when running the tracker with external power, whether you leave the batteries in or remove them. Also the green power
light on the controller is brighter when using external power, as is to be expected as USB supplies 5v as opposed to 3 x AA =4.5v.
I bought it online quite a while ago, but have only recently tried external
power. It looks like I'll have to find a way to contact Sightron.
cheers raymo
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