406014-02EN, Rev. 05
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ALM
®
12V7 s-Series User’s Guide
Chapter 5: Operation and System Design Considerations
After 6 years of continuous testing, original A123 Systems ANR26650
M1
A 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 ANR26650
M1
B cells.
Through testing under the same conditions, cells of this model are demonstrating further
improved cycle life behavior over their predecessors, as shown in
.
Figure 11 Cycle Life Test R1C/-1C, 23 °C, 100% DOD
NOTE
The number of cycles, as shown in
and
, are dependent upon average SOC,
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
