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Components:

250C style board for the Smart PWM V3 which can be attached with 2.54mm pitch header pins. 0.36" 3-wire voltmeter in cutout.

D1 - https://www.mouser.com/ProductDetail/Lumex/SSL-LX40FT3ID?qs=%2fha2pyFadujxBjlUmTzxXrCIgmGlcT2WBxtU6kQaw6TtNoou84YoUQ%3d%3d

D1-SPACER - https://www.mouser.com/ProductDetail/749-ELM-2-1MM

R1 - 0805 case current limiting resistor for D1. To determine value, look at datasheet for the LED, know the max voltage of your batteries & use an LED resistor calculator

S1, S2, S3 - https://www.mouser.com/ProductDetail/CK/KSC243JLFG?qs=%2fha2pyFaduim0ELFxiNWJQcb7PgIZAVM%252bUtoscAoCxI%3d

S4 - https://www.mouser.com/ProductDetail/CK/SS12D07VG4NSGAPA?qs=%2fha2pyFadugjks%2fHbHkDhssP9iJkVnkua0Q3TVFHBfbSkpRFT8OjGg%3d%3d

SMD Standoffs - https://www.mouser.com/ProductDetail/Wurth-Electronics/9774050943R?qs=%2fha2pyFaduh56NXAtVTpmqJZZkMdaEk9oK79b%2fR28SU49LV19DgYCw%3d%3d

M2 screws for securing SMD standoffs - https://www.ebay.com/itm/M2-x-6mm-Phillips-Flat-Head-Machine-Screws-Steel-w-Black-Ox-Countersunk-DIN-965/123267484421/

Pad wiring:

B+ to battery positive

F1 & F2 to optional off board momentary switch

VMM to voltmeter measurement wire (white or yellow)

VM+ to voltmeter positive wire (red)

VM- to voltmeter negative wire (black)