https://github.com/adafruit/USB-Power-Gauge
Power Gauge Breakout Holes:
All of the ICSP connections for in-circuit serial programming are available in the breakout holes on the edge of the board. These can be used with programmers such as our USBTinyISP.Connect to your programmer:
Using the 6-pin connector on your USBTinyISP, connect:-
MISO -> Tx
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VCC -> 5v
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SCK -> Clk
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MOSI -> SI
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RST -> Rst
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GND -> GND
For details on programming with the USBTinyISP, see this guide: