The Dicodes doesn't do it. It never varies the wattage from the set amount.
What it does do is let you set the minimum voltage at which it will stop firing - which is the voltage after battery sag. It then also displays on screen both the at-rest voltage and the after-sag voltage from the last vape. And it also has a mah counter, which if you reset it after changing batteries will show you the incrementing mah as you use the battery, and thus by the time of the low battery message is a total of what you got from that battery.
The minimum battery level range, in single battery mode, is 2.5V to 3.2V.
When the battery gets down to its lower levels of charge, it will sag a huge amount - up to 0.7v in my experience.
Therefore set to the minimum 2.5V, you will find your batteries are at about 3.2v when it says Low Battery and stops firing.
When I was getting the Dicodes I got excited thinking I could finally get more battery life out of my batteries - not understanding why all other mods stopped using them at 3.2v when I knew that 18650s were specified as safe taken down to 2.5v.
It was only after using it I realised how bad the sag was, and why all other mods stopped at 3.2v - because that's actually 2.5v after sag. So although the Dicodes lets me set a minimum, it still doesn't discharge my batteries any more than my other mods.
So it's only a benefit for those who want to lengthen the life of their batteries by never taking them, after sag, below 2.8v or whatever value. It doesn't give you more charge versus other mods which are already hardcoded to take them to 2.5v and no lower.
I keep it at the minimum because personally I'd rather go longer between charges and just buy replacement batteries now and then; they're not expensive. And I still haven't had to replace any, after 5 months of vaping on replaceable 18650s. Though I don't yet have an Analysing Charger which can tell me their resistance and total mah and stuff, so I don't know to what extent my older batteries are holding less charge.
I plan to get a charger like that eventually, probably the Opus BT-C2100 v2.2
I suppose I could use the Dicodes to monitor their mah, and keep a spreadsheet of results over time, but meh

When I first got it I did record some readings from various batteries, just to see how much I got out of a 2500mah versus a 2200mah etc. It wasn't all that interesting. 2087 mah from a 2600mah battery, for example.