Re: What is this and how do I make one...
How can you be vigilant with a RR? It either works properly or it doesn't, and you cant do anything to service it.
When my third one failed, I bypassed all wiring back to battery, and spent the extra £30 or so on the cooler running RR to be sure. It charges to 14.3 on the nail all the time, the old one (with old wiring) was never so perfect, even when new.
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