RX200 Battery life advice needed

[Deleted]

Does this add up i have 2 devices on the go
RX 200 running with 3x Shockli 3000 mah with a dripper 0.7 coil at 50w
I get about a day and a half between charge
Raptor 120w mod running with 2x Samsung 2500 mah with a dripper 0.7 coil at 50w
I get about just over 2 day and a half between charge
Both devices are used evenly but i thought i should get a bit longer usage from the RX200
RX200 has latest firmware

[minime]

I get about 5 to 6 hours at most on a .5 coil using same battery's as you, I don't think it's the battery's because I use them in my x cube with same atty and 2 battery's last me the day.

[SteveF]

The RX is power hungry, as is the DNA rolo.

Reason for not getting as much as you expected.......batteries in series.

3x 4.2v@ 3000mAh = 12.6v @3000mah, so really you still have 3000mah but without putting all of your amp load through one cell.

with the DNA200 the battery is set up by Watt Hour, (3x 4.2v)12.6v x 9000 (3000mAh x 3) divided by 1000 = 31.5 Wh

Of which you may get 20Wh of useable 18650 life. Down to 2/3 straight away.

You're only going to get extended battery life out of them in TC mode.

[Deleted]

May 31, 2016 14:48:07 GMT SteveF said:

The RX is power hungry, as is the DNA rolo.

Reason for not getting as much as you expected.......batteries in series.

3x 4.2v@ 3000mAh = 12.6v @3000mah, so really you still have 3000mah but without putting all of your amp load through one cell.

with the DNA200 the battery is set up by Watt Hour, (3x 4.2v)12.6v x 9000 (3000mAh x 3) divided by 1000 = 31.5 Wh

Of which you may get 20Wh of useable 18650 life. Down to 2/3 straight away.

You're only going to get extended battery life out of them in TC mode.

Why do i get longer life out my raptor mod which is also in series (i think) with 2x2500mah batteries ?
Is this one not as power hungry.

[VapingBad]

May 31, 2016 14:48:07 GMT SteveF said:

The RX is power hungry, as is the DNA rolo.

Reason for not getting as much as you expected.......batteries in series.

3x 4.2v@ 3000mAh = 12.6v @3000mah, so really you still have 3000mah but without putting all of your amp load through one cell.

with the DNA200 the battery is set up by Watt Hour, (3x 4.2v)12.6v x 9000 (3000mAh x 3) divided by 1000 = 31.5 Wh

Of which you may get 20Wh of useable 18650 life. Down to 2/3 straight away.

You're only going to get extended battery life out of them in TC mode.

It is more that each board has a set voltage it rejects batteries and how manufactures come up with the capacity ratings IMO.  IDK about the RX but the DNA 200 uses the voltage under load so losses in the wiring and battery contacts also play a part, but once one of the 3 cells drops to 2.85 V while firing it backs off and gives a weak battery warning.  So one weak battery will reduce your run time as will dirty contacts, again don't know how the RX handles this, but measuring the cell voltages when it starts curtailing the power should give you a good idea.   Typically battery manufactures rate the cells by discharging at a modest rate until they drop to 2.5 V which does not compare with mods like these drawing > 20 A and only discharging to 2.85 V under load which could mean your batteries getting rejected when the resting voltage over 3.5 V running at higher power.  DNA 200s are the most efficient board I am aware of rated a 97% efficiency, the screen and board use little power when not firing 18 milliamps active, 3.5 milliamps refining, and 25 microamps sleeping.

I have never been tempted by a Raptor, but I believe they just restart when the voltage drops too far under load, IDK at what level, but it could that it is just running the cells lower.  I have read a few complaints about the Cubis and RX200 battery life, but I haven't seen the efficiency rating nor the detail of how the low cell cut-off works.

[SteveF]

May 31, 2016 15:31:10 GMT VapingBad said:

May 31, 2016 14:48:07 GMT SteveF said:

The RX is power hungry, as is the DNA rolo.

Reason for not getting as much as you expected.......batteries in series.

3x 4.2v@ 3000mAh = 12.6v @3000mah, so really you still have 3000mah but without putting all of your amp load through one cell.

with the DNA200 the battery is set up by Watt Hour, (3x 4.2v)12.6v x 9000 (3000mAh x 3) divided by 1000 = 31.5 Wh

Of which you may get 20Wh of useable 18650 life. Down to 2/3 straight away.

You're only going to get extended battery life out of them in TC mode.

It is more that each board has a set voltage it rejects batteries and how manufactures come up with the capacity ratings IMO.  IDK about the RX but the DNA 200 uses the voltage under load so losses in the wiring and battery contacts also play a part, but once one of the 3 cells drops to 2.85 V while firing it backs off and gives a weak battery warning.  So one weak battery will reduce your run time as will dirty contacts, again don't know how the RX handles this, but measuring the cell voltages when it starts curtailing the power should give you a good idea.   Typically battery manufactures rate the cells by discharging at a modest rate until they drop to 2.5 V which does not compare with mods like these drawing > 20 A and only discharging to 2.85 V under load which could mean your batteries getting rejected when the resting voltage over 3.5 V running at higher power.  DNA 200s are the most efficient board I am aware of rated a 97% efficiency, the screen and board use little power when not firing 18 milliamps active, 3.5 milliamps refining, and 25 microamps sleeping.

I have never been tempted by a Raptor, but I believe they just restart when the voltage drops too far under load, IDK at what level, but it could that it is just running the cells lower.  I have read a few complaints about the Cubis and RX200 battery life, but I haven't seen the efficiency rating nor the detail of how the low cell cut-off works.

nice one VB, as expected a knowledgable answer to my laymans understanding, I had considered voltage drop and cut off but that was about 30 minutes ago when I was walking the dog and cursing my failure to put a fresh battery in my evic

And I've found something else to consider with my rolo although I've always thought it was just power hungry.....or is it just my vaping

[VapingBad]

Try setting the Mod - Manufacture Settings - Cell Soft Cutoff to 2.85 V SteveF it defaults to 3.09 V which is more suited to LiPos.

[SteveF]

May 31, 2016 16:41:51 GMT VapingBad said:

Try setting the Mod - Manufacture Settings - Cell Soft Cutoff to 2.85 V SteveF it defaults to 3.09 V which is more suited to LiPos.

I think it is set to 2.9v, the boards max low unless that has changed?
basically I swap out batteries at about 30% and have only ever hit the low battery once. had a couple of tail offs of power in kanthal mode but like I said I swap out long before.

[Deleted]