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Mine usually at 4 bars ,I think you'd better send Dave an email at Labradr in Aus db@taunbill.com.au
Top guy, knows his stuff.

Be carefull with the powerbank, the usb ports are a little fragile, as is the unit itself. Its not very resistant to knocks and bumps. I prefer rechargeable eneloops, they last very well. 75 rounds...