This was posted in another forum about the Hcigar HB-DNA40....... just passing along FYI:
Just came across a few units of the HB-DNA40 that are showing up with the "Weak Battery" error fairly early on. Units may work fine right out of the box, but when running high drain setups (multi coil, low resistance), it may create arcing at the grounding contact points, which create enough impedance to show the error. The higher the drain of the atomizer, the faster this error seems to occur. More tests need to be done to confirm this for certain, but the half dozen units or so that I've tested so far that bring up this error, it's beginning to show this to be the case.
From what I can tell, the anodization used on the casing is a dielectric, and the grounding screws for the 510 and the battery's negative terminal is screwed in a single time and not tight enough. This may not be enough to break through enough of the anodization in the casing's screw holes to create a proper connection. The small gaps of contact may be small enough to create some resistance, which results in an electrical arc during firing of high drain setups. The arcing results in carbon build up, which creates more resistance, and messes with the DNA40's sensitive readings.
The best preventative solution I've found so far, is to back out the screws and screw them back in a couple of times to break through more of the anodized layer to get better contact to the enclosure. Also, the factory did not screw the grounds in very tight, so it's recommended that they be made a bit tighter to create a better contact. Doing this seems to have solved the problems so far.
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