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For me, the Pencil being attached at all times is causing battery problems. When I leave it off the iPad after charging it up, the iPad loses hardly any charge at all in standby—maybe 1%. With it attached it will lose up to 10% overnight, and the pencil never goes into standby. In fact, I’ve seen the pencil start draining too even while attached.

It seems there’s a software issue where a) the Pencil isn’t going to sleep after being topped off, and b) the iPad in turn keeps thinking it needs to be charging the Pencil. I had my Pencil swapped out for a new one and am still having this issue.
Correct, when it’s attached it’s always charging, because the magnetic connection is the charger not a storage solution. To stop overcharging the Pencil will drop 1 or 2% and then charge back to 100%. Just like your phone and iPad does when they’re on the charger.
 
Interesting. Btw, there are moments when I pick up the Pencil after it’s been attached overnight and it is slightly warm. I didn’t notice a massive iPad power drain, though.
 
Correct, when it’s attached it’s always charging, because the magnetic connection is the charger not a storage solution. To stop overcharging the Pencil will drop 1 or 2% and then charge back to 100%. Just like your phone and iPad does when they’re on the charger.
But my issue is that both my original Pencil 2 and the replacement will stay topped off at 100% for a day or so, but then will start draining. The iPad Pro sees the Pencil is attached because the Pencil shows up in the battery widget with a percentage and without the charging icon next to it. The iPad is obviously trying and trying and trying to top it off again, but I think there’s something glitching in the Pencil’s software where it’s not flipping over into “top me off” mode.
 
I charged my iPad Pro (11") to 100% last night and left the pencil attached to it. By mid-day, the iPad was down to 85% battery, and I hadn't even touched it. It seems like just having the pencil attached has a significant effect on the iPad's battery life. Has anyone else noticed this?

I wish there was a setting to decide whether the pencil should charge or not. I'm not a heavy pencil user, so most of the time I'd prioritize the iPad's battery over the pencil's. But it seems that by default, the pencil is drawing on the iPad's battery to keep its charge at 100%.

If I leave the pencil attached but don’t plug in the iPad, it is exactly where yours is at, 85% overnight for me is approximately 6 hours. If I detach the pencil the iPad is at 100% in the morning. So for me, the pencil drains about 15% of battery life over approximately 6 hours. I thought my iPad had bad battery life until I decided one night to leave the pencil off. Pretty disappointed in this, because I know the pencil doesn’t need this much energy. Oh well. I just keep the pencil off now.
 
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If I leave the pencil attached but don’t plug in the iPad, it is exactly where yours is at, 85% overnight for me is approximately 6 hours. If I detach the pencil the iPad is at 100% in the morning. So for me, the pencil drains about 15% of battery life over approximately 6 hours. I thought my iPad had bad battery life until I decided one night to leave the pencil off. Pretty disappointed in this, because I know the pencil doesn’t need this much energy. Oh well. I just keep the pencil off now.
Same here. It is disappointing, but I think it’s going to keep being reported and will eventually be resolved. There are lots of people seeing this same behavior.
 
My Pencil remains at 100% battery after a few days of no use. I keep it in a drawer when not in use and my iPad in Flight mode when not in use so the Pencil isn’t waking or trying to connect.
 
My Pencil remains at 100% battery after a few days of no use. I keep it in a drawer when not in use and my iPad in Flight mode when not in use so the Pencil isn’t waking or trying to connect.
Yeah—as an experiment the other day, I charged the iPad Pro and Pencil up both to 100%, detached the Pencil, and let them both sit on my desk for like 2 full days without using either device AT ALL other than to lift the cover and see how the batteries were doing. Both devices sat at 100% for 2 full days. Even when I did eventually pick the iPad up and start using it, it still took 10 or 15 minutes of use to even go down to 99%. So the iPad obviously doesn’t have a battery issue, which is a relief, and the Pencil doesn’t seem to either as far as holding a charge for extended periods of non use.

If I use the Pencil regularly like I was a few days ago for a pretty big art project I was doing, that’s not as big of a deal. Using the Pencil, sticking it back on the iPad, using it some more, sticking it back on the iPad, etc. doesn’t seem to affect either device as far as battery drain. It’s when the Pencil sits there doing nothing for more than a day that it starts acting a little odd as far as not letting itself be topped off. If I take the Pencil off the iPad for a second and put it back on, that tops it back off to 100% and it stays like that for a day or so.

So, I really think this is a software glitch, and I’m not going to constantly store the Pencil on the iPad IF I’m not going to be using the Pencil a lot. Or, I might do what some others are suggesting and stick it on by one magnet so that it doesn’t start charging until I’m ready for it to start charging. I’m really hoping a Pencil firmware fix is coming sooner rather than later so I don’t have to worry about it anymore.
 
I noticed this issue after I first got my pencil and iPad. I thought the iPad had a battery issue as the life was so poor. Once my sleeve arrived, it had a spot for storing the pencil off the iPad, the life was what I expected. So I too hope apple addresses this.
 
Just got my Apple Pencil 2. Connected it to my 11” last night with iPad at 97% and the Pencil at 98%. Just grabbed my iPad around 9 hours later and it’s at 86%. That’s crazy battery draw.
 
I charged my iPad Pro (11") to 100% last night and left the pencil attached to it. By mid-day, the iPad was down to 85% battery, and I hadn't even touched it. It seems like just having the pencil attached has a significant effect on the iPad's battery life. Has anyone else noticed this?

I wish there was a setting to decide whether the pencil should charge or not. I'm not a heavy pencil user, so most of the time I'd prioritize the iPad's battery over the pencil's. But it seems that by default, the pencil is drawing on the iPad's battery to keep its charge at 100%.
I’ve also noticed excessive battery drain in standby on my 2018 Pro when I leave the Pencil attached. So now I set it to the side during standby periods.
 
Just another data point.

Last night at 5 my iPP 12.9 and Pencil v2 where at 100% charge.
I left the pencil attached over night.

12 hours later the iPad was at 95% and the pencil at 90%.

iPad is wifi only, probably received a few push notifications.

I was surprised to see the pencil at 90% as I thought it would continue to be charged by the iPad.
 
I’ve had several situations recently where my pencil has been dropping charge, even as low as 8% despite being attached to the charging connected.

I wonder if this is a bug of some kind in the latest release of iOS?
 
Is there a threshold of battery remaining of the pencil before it will start charging when the iPad is NOT plugged in (charging)?

I ask because I noticed as soon as I plugged my iPad into my laptop, the Pencil charged to 100% in a short period of time.
Just another data point.

Last night at 5 my iPP 12.9 and Pencil v2 where at 100% charge.
I left the pencil attached over night.

12 hours later the iPad was at 95% and the pencil at 90%.

iPad is wifi only, probably received a few push notifications.

I was surprised to see the pencil at 90% as I thought it would continue to be charged by the iPad.

Is there a threshold of battery remaining of the pencil before it will start charging when the iPad is NOT plugged in (charging)?

I ask because I noticed as soon as I plugged my iPad into my laptop, the Pencil charged to 100% in a short period of time.
 
I posted this is another thread, but may be more appropriate here:

I will have to check for the charging then draining issue while attached to the iPad. I think I recall seeing 98% after reaching 100%, but I was more interested in topping off the Pencil to learn the lifespan and to make sure it sleeps after not being in use for a while.

I seem to be experiencing where my Pencil will charge to 100%. When I remove it, it will eventually sleep and disconnect from the iPad. However, it will still slowly drain on its own. After almost 24 hours and it went from 100% down to 90%.

While not a whole lot, my understanding is that the Pencil should hold its charge and remain at 100% easily for a few days if never in use. Not sure if others are experiencing similar or if this okay behavior. I’m thinking of exchanging it since it was an open box purchase, just to see.

When I noticed that the Pencil seemed to always want to charge when attached to the iPad, I decided to take it off when not needed and keep it in the small loop case I bought for it. The Pencil will go to sleep when stationary after a certain amount of time.
 
I got my iPad and pencil on launch day. I no longer see any battery loss when I take the pencil off when it’s fully charged. Literally still at 100% after a week. I also no longer notice any drain on the iPad if I leave mine attached and unused. Obviously if I use it and then reattach it, it drains the iPad a little bit.
 
Just got my Apple Pencil 2. Connected it to my 11” last night with iPad at 97% and the Pencil at 98%. Just grabbed my iPad around 9 hours later and it’s at 86%. That’s crazy battery draw.
Yep it's terrible. I was under the impression we were supposed to leave the pencil attached to the iPad at all times when not using it, which I guess you can but it's at the cost of your iPads battery.
 
This weekend I left the pencil on the ipad, both at 100% charge on Friday. This morning the pencil was at 45% and the iPad was at 86%
 
This weekend I left the pencil on the ipad, both at 100% charge on Friday. This morning the pencil was at 45% and the iPad was at 86%
My Pencil doesn't drain quite that fast, but after it hits 100%, both devices start draining and the Pencil stops getting topped off.

Anyone planning on running the new iOS 12 beta to see if this addresses the issue?
 
My 11” iPad pro was quite good for the first 1.5 month. But until now its battery sucks. It lasted about 10hrs screen on time but now roughly half of it. This also happened to my 1st gen ipp 12.9 last time. And my xs max seems got the same battery issue, sometime it’s better than I expected but sometimes it’s not.
I have been observing my ipad for this whole week, it has been like 17-20% battery for 1hr on Notability. Drain itself about 0.5% per hour.
[doublepost=1547194063][/doublepost]Seems like the battery issue somehow relates to iCloud, with out iCloud account logged in, my devices last longer. But I also don’t know where exactly it comes from.
Well, I'm relieved to report that it seems that it was the iCloud setup that was draining the iPad battery, rather than the pencil, as many of you suggested. I charged the iPad overnight and then removed the pencil. The iPad stayed at 100% for five hours with no use. Then I attached the pencil. 5 hours later the iPad was still at 100% even with the pencil attached.

I used the iPad and pencil lightly last night, then left the pencil attached and didn't plug the iPad in overnight. This morning the iPad is at 93% and the pencil at 100%. All is well.
 
Just got my Apple Pencil 2. Connected it to my 11” last night with iPad at 97% and the Pencil at 98%. Just grabbed my iPad around 9 hours later and it’s at 86%. That’s crazy battery draw.

For science, I’ve left my Pencil 2nd gen alone on my night stand and not used it since this post (January 1). It’s down to 35% when I picked it up today. That’s pretty impressive standby time.
 
Last night I made a test... iPad in standby without my pencil attached.
From 17.00 to 10.00: iPad 100% ---> 94%, Pencil 100% ---> 95%.

Previous nights, the iPad loose about 15-20%!

So, i think this is a bug!
 
12.1.3 is out today--I don't see anything in the release notes about it fixing this issue, but I'm topping off my iPad Pro and Pencil right now and will give everything a test run overnight. Keeping my fingers crossed.
 
I’m getting good results on 12.1.3 so far. Took the iPad off the charger at 3:00 PM and it’s now 10:30 PM. In that time the iPad went from 100% to 96%. The Pencil has been attached the whole time and has not drained down past 100%. So it seems that the iPad is now keeping the Pencil topped off the way it’s supposed to with a more or less acceptable amount of drain to the iPad’s battery. I’ll reserve judgement for in the morning though. If it’s down in the 80s, I still think that’s a pretty excessive amount of drain for less than 24 hours off the charger.
 
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Ok—12.1.3 didn’t fix this. My iPad Pro went from 100% to 88% since yesterday afternoon with the Pencil attached, and the Pencil went from 100% to 92%. So for me it looks like iPad battery drain improved a little and the Pencil situation got possibly a bit worse. Still not so bad that I won’t attach it and take it with me when needed, but bad enough that it will lay detached on my desk until I need the iPad to leave my office.
 
Not so for me on 12.1.3. I went to bed last night with the iPad at about 89% battery. This morning it was at 72%.
 
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