High power battery holder

High power battery holder for 4x18650.
The laser driver (IMS PCB driver or any other type of driver) is mounted inside the upper block of the holder and directly connected with wires to an opto-mosfet switch. There is a maximum voltage drop less than 0.05V at full load.
There is no current flowing thru the switch button because it's only a logical signal fully debounced and delayed by the opto-mosfet control logic at the bottom of the battery holder.
The battery springs are very strong to ensure an ultra low contact resistance.
The battery configuration can be changed by moving 2 wires. There are two configurations: all batteries in parallel (3.7V) and 2series-2parallels (7.4V).
The top block of the battery holder can host any type of driver and it's also the heatsink.
The optical head is attached on the top block.

That thing is massive! What does it drop into?

It is part of a laser handheld with 4W output and hopefully more. The optical head, which is almost finished, is mounted on the top of the battery holder.
In the preliminary tests with an efficient pbs cube and two good diodes i have obtained about 4W.
With this battery holder the operational time is also very long because the power losses are very minimized.

That sounds crazy! Please keep us updated with your progress. I would love to see pictures of the optical head.

T_Warne said:

That sounds crazy! Please keep us updated with your progress. I would love to see pictures of the optical head.

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Ok, in the meantime i have posted here some shots of the beam combiner test. Please let me know what do you think about