Charging time

[demusss]

How long should it take for the band to fully charge?

I have been reading on other posts/sites that a 20min charge should be enough for a day and that when the battery level is less than 50% it should be charging quicker.

I'm finding that it takes 1 minute to charge 1%.

Today I tested it, this is with band on but display off.
started at 8%
after 25mins reading 34% - increased by 26%
after 40mins reading 51% - increased by 43%
after 60mins reading 73% - increased by 65%
after 75mins reading 85% - increased by 77%
after 85mins reading 88% - increased by 85%
after 92mins reading 34% - increased by 88%
after 95mins reading 100% - increased by 92%

Is everyone else having the same experience. I'm using my Samsung Nexus 10 supply which has an output rating of 5V/2.0A

I'm going to try with the band switched off to see if that speeds anything up.

 

[indiW]

I am not 100% sure, however my band tend to reach 99%(from low as 20%) relatively quicker but comparatively longer to jump from 99% to 100 %

Posted via the Windows Central App for Android

 

[willow007]

Yup. My bands does the same.

I'm wondering about the 2A. I thought this device only consumes around 150mA so that even the weakest source should charge it with the maximum speed

 

[DroidUser42]

It's possible you need to fully charge the battery at least once for the charge controller chip to have a handle on the situation and allow fast charging.

 

[demusss]

The band has been fully charged several times. When I first got the band that was the first thing I did.

 

[VFC]

I charge my Band 2 every morning using the USB 3 port of my Dell laptop at work. Normally the charge is ~ 50% when I start. It takes about one hour to get it back to 99-100%.

 

[DroidUser42]

I forgot to add, make sure it's not getting warm - like not putting it in direct sun or on something warm. A bit of airflow might help. Bottom line, if it's sensed that the battery is getting warm, the charge rate will be cut drastically.

 

[lankylars]

This is my anecdotal observation - I haven't carefully timed it out - but I can get from roughly 30% to 100% in a around an hour. I have the Band 2 cable plugged into an Anker PowerPort +1 (supports QuickCharge 3). This is overkill, obviously, but I had the charger laying around unused. The Band 2 does not use the QuickCharge standard and obviously does not draw anywhere near the full power supplied by the charger.

 

[demusss]

I had a chat with Microsoft support the other day. The outcome was basically it was charging correctly and also a little bit quicker due to the powerful supply.

Here's a couple of extracts from the chat.

Me: should it be quicker from 0 to 50% or is it a constant rate? I'm getting about 1% increase every minute.
Them: I have seen it change some bands will charge very quickly to 70% then stop and it will take up to two hours to reach 100% but on my personal band I find it goes slow up to about 50% or 60% then it will speed up to 100%.

Me: I took some timings last night
Me: started at 8%, after 25mins reading 34% - increased by 26%. After 40mins reading 51% - increased by 43%. After 60mins reading 73% - increased by 65%. After 75mins reading 85% - increased by 77%. After 85mins reading 88% - increased by 85%. After 92mins reading 34% - increased by 88%. After 95mins reading 100% - increased by 92%
Me: does these look correct?
Them: Yes it does look correct as it is taking roughly an hour to get to 70% then a further 30-40 minutes to reach 100%. How would you charge your band with the USB in a device or a socket?

Me: I'm using my nexus 10 power supply. Its rated at 5V/2.0A
Them: I have just double checked the stats of the power supply against our battery functions and the charging time you are receiving is correct. You are getting a slightly more powerful and quicker charger as it normally would take about 1.5 hours to charge your band and the average time would be 2 hours.
Me: ok good thank you for confirming it is charging correctly. I have seen posts with people saying that a 20 min charge whilst in the shower should give enough to last a day. clearly this is not the case
Them: No not at all, that may actually cause an issue with the band as they would not be leaving it to re-charge fully.
Them: You could maybe get a few hours from the band doing that, but it would not last too long with any of the function tiles running.

 

[DroidUser42]

Battery charging any Li-ion goes though 2 or 3 stages. At lower percentage, it can do a faster charge. As it gets close to fully changed, it has to be more careful. Usually, this translates into slowing down. I think partly to make sure it doesn't over charge any one cell in the pack. When you overcharge a Li-ion, it becomes chemically unstable. AKA, explodes.