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AW Li-ion 14500 Blue Label (LIR 14500) Battery Analysis

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  Introduction:
AW Li-ion 14500 Blue Label battery is one of the first protected rechargeable Lithium ion batteries in standard AA Size brought to market by AW in first half of Q3 2005. The cells feature additional electronic protection over the standard 14500 Lithium ion cell. The cells are fully protected against overcharge, over discharge, over current and short-circuit and are safe to use in single/multi-cell applications.

CAUTION: For safe operation, please handle Lithium ion batteries should with respect. Do not expose to, dispose off the battery in fire. Do not put the battery in a charger or equipment with wrong polarity. Avoid electrically shorting the battery, excessive physical shock or vibration. Do not disassemble or deform the battery. Do not immerse the battery in water. Do not mix and match batteries of different types, make, or model. Most importantly, keep out of the reach of children. Charging and Discharging: Battery must be charged in appropriate charger only. Refrain from using a modified, broken or damaged charger. Storage: Store the battery in a cool, dry and well-ventilated area. Disposal: Regulations may vary from place to place in different countries. Please dispose the battery in accordance with local regulations.

AW Li-ion 14500 Blue Label Battery Features:
  • Protected cell with anti-explosion Vent / PTC (mechanical thermal protection)
  • Electronic PCB protection featuring PCM
  • PCM: Overcharge Detect Voltage: 4.35V
  • PCM: Overcharge Reset Voltage: 4.15V
  • PCM: Over-discharge Detect Voltage: 2.5V (3.0V under load)
  • PCM: Excess Current Threshold: 2.5A
  • PCM: Excess Current Detect Voltage: 0.2V
In-Depth Review & Pictures:
Size Comparison: Measuring 51.6mm length x 15.2mm diameter AW 14500 Blue Label Lithium Ion Battery is slightly larger when compared against standard size of 50.0mm length x 14.5mm diameter. Additional length is attributed to electronic protection PCB is placed over the standard 14500 Lithium ion cell. Here is a picture comparing standard AA battery and AW 14500 Li-ion rechargeable battery. In the picture, you can easily notice the difference in length.


Pictured below is comparison of diameters between standard AA battery and AW 14500 Blue Label Lithium Ion Battery.


Side view of AW 14500 Blue Label Lithium Ion Battery the PTC is located at the positive end of battery. There is a strip connector connected at top of positive terminal. This connector strip supplies current to electronic protection circuitry located at the negative terminal end.


Electronic protection circuitry is located at the negative terminal end of the Lithium Ion Battery. You can clearly see the gold plated PCB at the negative terminal. Also notice the thru hole dots on PCB.



Battery Analysis & Results:
Testing Equipment: Vencon UBA5 was used for it's extensive capabilities. Vencon UBA5 not only allows charging and discharging of batteries, it also enables unlimited possibilities for creation of analysis routines.

Battery Condition: The batteries used for this test are manufactured in Q3 2005 where as the test are performed in Q4 2008. The number of charge discharge cycles on these batteries is certainly more than 350. Considering the fact that typical lifetime of Lithium ion batteries is about 36 months from the date of manufacture, it is safe to conclude that they are in at the end of their lifetime.

Test Condition: The tests performed considering battery capacity of 750 mAh as 1C for all three test routines. For each charge cycle, the battery charged at 4.2V with charge current as either 0.5C or 1C. Charge termination current in both the cases is at 0.05C. For each discharge cycle, battery discharged at constant current discharge rates of 0.2C, 0.5C or 1C depending on the routine with discharge termination voltage of 2.75V. The test was performed twice on different battery samples of same batch.

Routine 1 applicable for cycle 1, 2, 3 for both the batteries.

Typical Voltage vs Time curve for AW Li-ion 14500 Blue Label (LIR 14500) Battery with the above routine is as per the below graph


Routine 2 applicable for cycle 4, 5, 6, 7 for both the batteries.

Typical Voltage vs Time curve for AW Li-ion 14500 Blue Label (LIR 14500) Battery with the above routine is as per the below graph


Routine 3 applicable for cycle 8, 9, 10 for both the batteries.

Typical Voltage vs Time curve AW Li-ion 14500 Blue Label (LIR 14500) Battery with the above routine is as per the below graph


Table below summarizes results for first sample.
AW Li-ion 14500 Blue Label (LIR 14500) Battery Analysis: Cell 1
Cycle Duration
(h:m:s)
Charge I
(mA)
Charged
(mAh)
Duration
(h:m:s)
Load I
(mA)
Discharged
(mAh)
Chr - Dis Total Time Efficiency
1       3:56:40 149.4 587.6 -587.6 3:56:40  
2 2:01:12 375.0 552.8 3:56:56 149.4 588.2 -35.4 5:58:08 106.40
3 2:02:38 375.0 562.1       562.1 2:02:38  
4       1:34:17 369.0 580.1 -580.1 1:34:17  
5 1:53:59 375.0 499.8 1:34:20 369.0 580.2 -80.4 3:28:19 116.09
6 1:54:26 375.0 501.0 1:34:31 369.0 581.4 -80.4 3:28:57 116.05
7 1:55:34 375.0 504.9            
8       0:44:17 751.3 554.5 -554.5 0:44:17  
9 1:39:59 750.0 578.2 0:44:28 751.3 556.8 21.4 2:24:27 96.30
10 1:39:18 750.0 593.8       593.8 1:39:18  

Table below summarizes results for second sample.
AW Li-ion 14500 Blue Label (LIR 14500) Battery Analysis: Cell 2
Cycle Duration
(h:m:s)
Charge I
(mA)
Charged
(mAh)
Duration
(h:m:s)
Load I
(mA)
Discharged
(mAh)
Chr - Dis Total Time Efficiency
1       3:40:47 153.5 563.6 -563.6 3:40:47  
2 1:50:04 375.0 566.1 3:39:54 153.5 561.4 4.7 5:29:58 99.17
3 1:50:00 375.0 567.1       567.1 1:50:00  
4       1:27:59 373.1 547.1 -547.1 1:27:59  
5 1:50:19 375.0 579.4 1:28:02 373.1 547.5 31.9 3:18:21 94.49
6 1:48:53 375.0 580.2 1:27:48 373.1 546.0 34.2 3:16:41 94.11
7 1:46:14 375.0 577.2            
8       0:41:56 747.2 522.2 -522.2 0:41:56  
9 1:35:24 750.0 495.7 0:43:08 747.3 537.1 -41.4 2:18:32 108.35
  1:32:27 750.0 496.4       496.4 1:32:27  

Here is the chart with graphical representation of battery capacities.


Based on the above results, it is evident that the cells perform particularly well in spite of aging.
Reviewed: 2008-11-10
Updated: 2008-12-12


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