ok, so I've tried Turnigy LSD, Duracell and Eveready AA rechargeable batteries, all seem to die after a short period of time. I was reluctant at first to post it over on THF until I had checked it further and other people started the same thing. Then I was reading on the UK forum across the pond and found this where they guy did a thorough test, here is his information:
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On a different point completely, I have done some measurements of the the power required to run the X sight and the voltages at which the low battery warning comes on and eventually switches itself off
With the Wi Fi and GPS switched off the sight draws approx 1.8 watts of power and with the Wi Fi and GPS switched on it's approx 2 watts - so not that much difference.
There's no discernible difference in power drain in day or night mode , nor in image capture or recording mode
With 1.5 volt alkaline batteries, the current drawn is approx 600ma which is quite high for even good quality alkalines to sustain
With 1.2 volt rechargables, the current drawn is 750ma which is well within the comfort zone of any decent rechargeable
The battery set up is 2 in series and those 2 in parallell with another 2 in series (2S 2P)
That means the sight is working with a nominal voltage of between 2.4-3 volts depending on which type of battery is being used
The low battery warning symbol comes on when the battery voltage drops to 2.6 volts (1.3 volts per cell) - which means that with rechargables, the low battery indicator will appear very soon after switch on - even with a fully charged set of batteries.
Auto switch off because of low battery voltage happens when the battery voltage reaches 2 volts (1 volt per cell)
Because of their much flatter discharge curve, rechargables should be able to keep their voltage above 1 volt for a lot longer than alkalines
I was looking at reviews of different rechargable batteries and chargers and as some forum members have already discovered the Duracell duralok 2400mah appear to have real capacities pretty close to the stated value and the charger safely putting the most charge into rechargable batteries appears to be the Nitecore D4".\
So I guess I'm going to run down to the store and pickup some Duracell Ultimate AA lithium batteries and give them a try. Have to last longer than the 10-15 minutes my current rechargeables are lasting, even though they are nearly at full charge.