FORUMS

Time-Lapse with ChronoSnap – XDA App Review

Some of the most interesting pictures are time-lapse animations that capture the … more

XeroAsh Theme for CM12

This theme by XDA Senior Member balrajs99 features a black and slate gray UI that gives your phone a … more

Samsung Galaxy S6 To Receive Major Camera Update

When the Samsung Galaxy S6 and S6 Edge were launched, they became the prime focus for … more

Tactile: An Addicting Game with Beautiful Material Design

The game industry has been around for decades, catering to a wide … more
Post Reply Subscribe to Thread Email Thread

Technical details about nook HD+ charging

7th September 2014, 12:29 AM |#11  
Junior Member
Thanks Meter: 8
 
More
Quote:
Originally Posted by invinciblemo

I would like to ask does anyone knows, what is the voltage of a fully charged battery?

Lithium-ion cells are typically charged to 4.20V. The Nook HD+ uses that value, too. Nominal voltage is 3.7V. I forgot the cut-off voltage that the HD+ uses to decide that the battery is empty, but I think it was 3.4V or 3.5V.
The Following User Says Thank You to Tzul For This Useful Post: [ View ]
 
 
10th September 2014, 01:58 PM |#12  
OP Junior Member
Thanks Meter: 4
 
More
Quote:
Originally Posted by Tzul

Lithium-ion cells are typically charged to 4.20V. The Nook HD+ uses that value, too. Nominal voltage is 3.7V. I forgot the cut-off voltage that the HD+ uses to decide that the battery is empty, but I think it was 3.4V or 3.5V.

To add to that, make sure you put a load on the battery if you are measuring the voltage of the battery disconnected.
Something like a single 330 ohm resistor would be good.

Bad lithium batteries sometimes will appear charged until you place the load on it then it falls to 2 or lower volts.
Another quick check is to make sure the battery casing is completely flat, if the battery has bulges of more than a few millimeters the battery is about to fail and should be discarded immediately. Another trick you can use is smell the battery, I know sounds weird , but failing lithium batteries have a very unique odor , almost sweet, reminds me of the smell of bananas.
11th April 2015, 01:28 PM |#13  
Junior Member
Thanks Meter: 0
 
More
Quote:
Originally Posted by Tzul

[*]Nooks will only fast charge on dedicated charging ports, which are recognized by having their data pins shorted. That's more or less standard nowadays for generic USB chargers (USB Battery Charging Specification). However, some chargers still don't meet this requirement, and Apple has their own incompatible standard, naturally.[*]Don't use your tablet if you want to charge it from a low-power source (i.e. USB data connection on the Nook), because depending on the workload, the battery will be charged very slowly or will actually be discharged.

I have an HD+, which I have not been able to get to charge on a 3amp, 2amp or even a 1amp wallwart, but it does charge via its Nook wallwart. Does the above mean that were I to 'repurpose' a short USB extension and simply short the D- and D+ (clear of the +ve and ground) together in the USB lead, that I should then find it will charge via that lead? Please?
Post Reply Subscribe to Thread
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes