Shelf Life; Cycle Life Test Results +1C/-1C, 23 °C, 100% Dod - NEC ALM 12V7 s-Series User Manual

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ALM 12V7 s-Series User's Guide
After 6 years of continuous testing, original A123 Systems ANR26650M1A cells still retain
65% of their initial capacity after 20,000 full depth of discharge (100% DOD), +1C/-1C cycles
at 23 °C. The ALM 12V7 s-Series batteries use the next generation ANR26650M1B cells.
Through testing under the same conditions, cells of this model are demonstrating further
improved cycle life behavior over their predecessors, as shown in
NOTE
The number of cycles, as shown in
charge/discharge rates, temperature and calendar time. Actual results will depend on specific use
case. Contact NEC Energy Solutions for more detail.
NOTE
Overall system life is a function of Shelf Life (Time at temperature) and Cycle Life (charge discharge
rates and watt-hour throughput).

Shelf Life

ALM 12V7 s-Series batteries ship from the factory at approximately 100% State of Charge
(SOC) and can remain functional for two years of shelf life where temperatures do not exceed
25 °C.
ALM 12V7 s-Series batteries being shipped by Air must comply with ICAO regulations, which
requires that the batteries be at or below a 30% SOC. These batteries shipped by Air can
remain functional for eight months of shelf life where temperatures do not exceed 25 °C.
Storage temperatures above 25 °C accelerate the rate of self-discharge and reduce the shelf
life.
At 10% SOC, the ALM 12V7 s-Series battery has about 5% of usable energy, on average,
before entering into an Under Voltage Protection (UVP) state as described in
406014-02EN, Rev. 05
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Figure 11 Cycle Life Test Results +1C/-1C, 23 °C, 100% DOD
© 2016 NEC Energy Solutions, Inc. All rights reserved.
Chapter 5: Operation and System Design Considerations
Figure 10 and Figure 11, are dependent upon average SOC,
.
Figure 11
Over Discharge
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