At least with the AS2 Pro I’ve become comfortable enough with the battery life not to worry about it. I don’t charge it very often at all, it’s usually in the door pocket of my car if I’m not riding. It was pretty cold here over the winter and it tolerated that as well just fine. Each time I think about charging it I take it into the shop and top off or inflate as many tires as I can to see how it was holding and I’ve always been impressed. It doesn’t take long to charge, it does quite a bit with a good charge and it holds a charge well so that I don’t have to worry about it. I carried CO2 in the past, still have some stuff laying around, I am far more confident in my electric pump than I would be having 2x20 CO2 cartridges with me, it’s not even close.
Since they are much more useful than CO2, I tend to use them more. I’ll use the AS2 pro at times to top off my MTB tires to a specific pressure at the trailhead instead of bringing a pump, or similarly if I want to make an adjustment during the ride due to some loose / sandy soil I can let out pressure then top off again for riding on firmer surfaces back home.
I’m not worried about the battery being drained by doing stuff like this - I’ve tested the battery life after doing top offs and they have virtually no impact.
I get the concern about just putting something in a bag for 2 years and wanting to guarantee it will work to you when you get to it, but for MTB at least this is something I keep in my pocket and have a regular habit of topping off the charge like I do for my computer and other electronics.
Does it work on Presta valves or does it come with an adapter for them?
Have used mine 3 or 4 times now and I’m a big fan over CO2’s, you can finish your ride with the correct amount of tire pressure instead of just whatever seems acceptable when you use C02, mine weighs the same as the 2 co2 and valve I used to carry and can fill at least 3 flats per charge. I’ve had multiple times in the past using CO2’s where the valve wasn’t on right or there was an issue with the presta and I’ve dumped my CO2’s and not inflated the tire enough and there’s much lower risk of something like that with the electronic version where it’s monitoring pressure IMO. I just think these are a much better solution, plus the fact that it’s a one time purchase. I just charge mine either after use or whenever I charge my Di2 and Assioma and it has always been around 96% still so it doesn’t lose much battery at all when stored, I guess if you went like 6 months or something maybe it would be an issue but even then I bet you would have 1-2 fills on a 60% battery. I was carrying both at first because I wasn’t sure how much I trusted it either but I’m pretty confident in it now having used it a few times, I guess my rides aren’t really a huge risk because I could always call for a ride or worst case Lyft/Uber home if needed, I could see if you’re doing more remote rides maybe having both.
I share the concern about the battery: When it‘s years old the battery will get weaker, also I may forget to top it up once. We had a long ride last week with two flats and one additional repump (user error). Also it‘s one battery more… there are already too many batteries to think about.
I have a mini hand pump which is cumbersome to use, but has one big plus: It will always work. Always! Also it‘s smaller than the electric pumps (just a bit „long“ in shape). I have used it so many times, even instead of co2.
That‘s a good use indeed. And a con of the pump which will end in a random pressure (usually too low).
What if the pump was an ant+ or bluetooth device and could warn you of low battery like axs shfiters or power meters? I think that would be nice. Less anxiety of just keeping it in the saddle bag and charge only when necessary
The thing with batteries is that they can fail and backup things shouldn‘t fail in my opinion. Not that the electric pump will fail exactly in the wrong moment.
I went on a ride last week, Garmin told me after an hour (!) that my left axs shifter battery is critically low. Strange, but ok, I have a backup in the saddle bag. I come home, check with the phone over bluetooth - battery is actually full.
Things like that don‘t make it feel reliable enough. It‘s rare, but it happens. Batteries have low voltage or are cold, maybe communication issues, whatever.
I seriously don‘t want to be stranded in a valley where there are no paved roads and I have to walk 10-15km to the civilization. This never happened, but it‘s a nightmare of mine.
I’ve had a CO2 inflator head effectively explode when I tried to use it before. I’ve seen people use their only and rarely but sometimes even 2nd CO2 due without inflating the tire all the way due to some other mishap.
I think it’s totally fine for people to keep using CO2 if they prefer it, but in my experience nothing* is 100% fullproof.
*minipump is pretty close, and is what I used to carry for MTB but boy is that a royal PITA when you’re inflating a 2.4” tire.
Yeah, with big tires we do a „100 times me, 100 times you“ then we are done in some minutes and our thin arms are still alive. The pump still has to fail me even when I don‘t like using it (fiddly adapter).
But back to the topic, sorry. 
Actually the reason I‘m in this topic: I have been thinking about buying one of these pumps and see myself doing it once some friends tell me how great and reliable it is. 
I mean it‘s a cool gadget.
I forgot to post here that I bought the Cyclami A2 Plus from AliExpress early this year, and it was essentially dead on arrival. It inflated for about 5 seconds and then shut off. I thought it just needed to be charged, so I left it to charge overnight and the same thing happened the next day. I returned it, and needless to say I will be going with a more reputable brand (like Cycplus) if I decide to get another.
I’m mostly interested in having one for the pre-ride top-off, so I don’t actually need one that’s so small. In fact, a larger unit will be easier to handle than the tiny ones for garage inflation anyway. Mid-ride punctures are extremely rare for me, so I’ll probably stick with the C02 cartridges for most of my rides and throw in a mini pump in addition to those for bigger adventures. I already have enough battery-powered things I need to remember to charge regularly and don’t feel like adding something from my saddle bag to that list anyway.
It’s kool
Buy one even if you don’t use it. Drop it accidentally at the start of a group ride. Good conversation starter.
If we’re comparing worst case scenarios and looking for failure points, the above isn’t true either. Pumps can and do fail, I’ve heard multiple stories about little used ones not working when finally needed. In fact, the reason I started carrying co2 was when a pump failed when trying to reinflate mine and my partners tyres when arriving back home off a flight due to the gasket melting from excessive heat!
I agree a pump will usually work, but it does need regular checking and maybe preventative maintenance and on super long rides I will always carry some sort of back up - on topic, probably an electric pump in future 
How many times have we seen riders with dead CO2’s or watch them as they completely screw up inflating a tire with them,leaving them stranded in th4 side of the road / trail?
I still carry CO2’s on the bike vs. a mini-pump, but the concern over a mini-pump failing isn’t even close to being an issue for me.
I made the plunge. Amazon has the Cycplus AS2 on sale and is half the price of the Pro. It’s to put in my saddle bag, just for emergency, nothing more. I think this will fit the bill. We’ll see.
What’s wild is I bought a Lyzene mini pump when I first started bike commuting. REI was across the street from work, and I needed something to get home, and it was the cheapest.
10+ years later, it still works. Though I rarely use it anymore.
The Lezyne mini pump I have unscrews valve cores fairly often.
Yes, works great on presta, has adaptors for all valve types. My wife also loves it as it’s easier for her than a track pump and getting the right PSI is simple.
Seems I‘m shopping these pumps. I like the idea to use them to top up air on the bikes.
Seems no pump is waterproof. Do you all take a waterproof pouch with you? We get surprised by rain here and there.
Also heat while pumping on TPU tubes may be am issue. Someone has experience with TPU valves?
Based on their use, I couldn’t see any being advertised as waterproof for sure. That being said, while the pro comes with a bag to put the pump in to prevent it from excess rain/sweat, it does seem like would be pretty-ok if not directly rained on or sweated on. I’ll probably use the bag regardless if it’s in a jersey, but it does seem pretty robust.