Jvape78 Posted October 22, 2015 Author Report Posted October 22, 2015 Been having some issues with my dual 18650 build. I keep getting massive battery sag whenever the battery gets to 3.8 standing charge. At above it barely sags at all but below 3.8 it sags so much it trips the low battery message! That's just running a .08ni build at 45 watt btw. So I notice the soft cutoff is set at 3.09v and I'm wondering if it's ok to drop it to like 2.8 or so? I just bought a set of hg2,3000mah today and gonna see if that helps. I'm currently using 25r and vtc5. All sets are long married. They're at least 6 months of use on them but they seem to still work great and always take a full charge though. .
blueridgedog Posted October 23, 2015 Report Posted October 23, 2015 No. That is too low. Going below 3v may result in you not getting it back up and there is so little usable capacity at that point regardless. The more logical solution is what you have already done and that is to assume your current batteries are just tired and replace them.
VapingBad Posted October 23, 2015 Report Posted October 23, 2015 There is a hard cut off of 3 V so that is the lowest that the board will respect.
Jvape78 Posted October 23, 2015 Author Report Posted October 23, 2015 Well there's a lot of mods out there that have the chip flash low battery at 5.4v. So that means the batteries are respectively hitting 2.7 under load yes?
VapingBad Posted October 23, 2015 Report Posted October 23, 2015 Could be the pre-release firmware that manufactures & resellers should have updated before release.Hard cut off is actually 2.85 V, it is not the first time I got that wrong https://forum.evolvapor.com/topic/67884-topic/?do=findComment&comment=911120
Jvape78 Posted October 23, 2015 Author Report Posted October 23, 2015 I lowered mine to 2.9 last night and I'm gonna monitor the sag periodically throughput the day. I'll report in once I see how these new hg batteries act under 3.8.
Jvape78 Posted October 23, 2015 Author Report Posted October 23, 2015 This is probably covered somewhere in the forums but why do we need to input the discharge curve? And what controls the battery meter on the display itself? Does it read voltage off the sled then compare that to input we tell it for total mah capacity? If so shouldn't that be all the info it needs? I'm curious as to why the discharge curve input is necessary and what function it provides in the chip operation. Just curious
Dejay Posted October 25, 2015 Report Posted October 25, 2015 Jvape78 afaik the discharge curve is only used for the battery meter to be more accurate how much energy your battery really has left. The voltage doesn't drop linear so you need the curve to correct that.
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