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Is anyone still having issues with the newest releases of the DNA 40 and re-settable fuses?
What issue are you having T?I'm still using the first 2 beta boards with no issues. They are both wired to PTC fuses.
For the DNA40, I was using 1x 7A fuse on each batt for dual parallel batts and had no issues, but some people are having weak batt message from the fuses going into a pre-trip state during TP preheat, so are using 2 x 7A fuses in parallel for each batt. That's how I am currently doing the build too - 2x 7A fuses parallel per batt for dual parallel batts.http://www.digikey.com/product-detail/en/2920L700SLPR/F6137CT-ND/4147147
Also, if you're looking to the fuses for reverse polarity protection, the RUEF series of fuses do not provide reverse battery damage.
It will protect no matter if using single or 2x in parallel on each batt in a parallel batt setup.
Yes, I'm using 2x 7A fuses wired to each batt in a dual parallel batt configuration for the 40. The DNA40 can pull up to 16A input current and up to 23A instantaneous peak for output. 1x 7A fuse on each batt in a dual batt configuration for a total Ihold of 14A is not high enough of a hold current to not trip the fuses if the user maxes the current during a vape. This is the problem some users were having with 1x 7A fuse on each batt - tripping the fuses and getting the weak batt message when maxing the current. 2x 7A fuses on each batt solves that issue and still protects if the user should accidentally put a batt in backwards.If you're using lipo batts as in that iStick, there's no worry about protecting for reverse polarity. Just need to know max input current and use a total number of fuses divided among the total number of batts that at least meets that max current.If you're using quad parallel batt configuration - 1x fuse on each batt would be sufficient. You could look for fuses with a lower Ihold with a 4 batt configuration if you're not needing a fuse that will also protect from reverse polarity damage.It's best to protect each batt with its own independent fuse. If one batt goes bad or wonky or dumps its current, not only will the circuit be protected but each batt will be protected from that bad batt by its fuse.