Canon DSLR NP-E3 battery modification

Specification:
Output: 12-14V adjustable (9V at battery lo)
Ouput capacity: 1000-1200mAH
Maximum output current: 2A
Continuous output current: 1.5A
Input: 7.2V 2600mAH Li-ion (battery lo 2.7V per cell, cut off at 2.55V)
Topology: Boost
Switching frequency: 500kHz
Efficiency: 80-90%
Sleep current: 2uA

As it still under testing phase, put some picture first, may upgrade this post later.

Testing Result:

Continuous ~1.5A discharge on electronic load, 2600mAH cell last ~2817 seconds, which is ~47 minutes, average current draw from battery cell ~3.2A ~23W, output ~1.5A 12.5V(8-13, average ~12.5V) ~18.75W, efficiency ~ 82%.

When battery charge is nearly depleted, output drop to 9 V provide battery lo indication for 1-2 minutes, which is enough for a camera to shut down.