Page 595 - Battery Reference Book

51/32 Nickel batteries
Table 51.32 Summary of GEC sealed nickel-cadmium cells (rechargeable)

Feature Cylindrical cells Rectangular and oval cells Perma-cells
Range of capacity ratings (Ah)
0.1 to 5.6
at 1 h rate C Top view 0 0.45 to 4.0
4.0
Outline

Sealed construction Yes Yes Yes
High-pressure resealing vent Yes Yes Yes
Modular packaging efficiency Good Excellent Good
High-rate discharge Excellent Excellent Excellent
Low-rate discharge Good Good Good
Maintenance-free Yes Yes Yes
Position-sensitive No No No
Constant-potential charge No No No
Constant-current charge Yes Yes Yes

1.4~ replaceable cell applications. These chargers operate
under optimum conditions for safe operation (that
is, avoidance of pressure and temperature increase).
Details of three available types of GEC charger are
given in Table 51.34.

Eagle Picher
This company supplies the Carefree I1 range of
rechargeable sealed nickel-cadmium button cells.
0.4 1 (The company also supplies sealed lead-acid batteries
under the trade name of Carefree.) Three ranges
are available. The ZA series (Table 51.35) has twin
Type 1/3 AA, 100 mA h electrodes and is designed to produce maximum
0.2
capacity with low internal resistance. The Carefree I1
nickel-cadmium batteries and cells provide a wide
0 20 40 60 80 100 120 140(%) range of capacities (from 30 to 600mAh) and the
flexibility of stacking cells to produce the required
0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 voltage.
(A hl The ZA series offers maximum performance when
Rated capacity
discharged over a long period of time at a low rate.
Figure 51.23 Typical discharge curve for General Electric sealed The Z2A (Table 51.36) series has dual twin electrodes
nickel-cadmium cells (Table 51.33) (Courtesy of General Electric) which, instead of the standard 1.2Vlcell has an e.m.f.
of 2.4 V. This requires less space than individual single
cells require. These twin cells can be series connected
BC-48B will recharge up to 48 C-size model CG-2 to provide multiple voltages. The DA and VA series
Perma-cells. Model BC-448 is designed to recharge of cells (Table 51.37) provide excellent performance
from one to 48 heavy-duty model GC-4 Perma-cell under high-rate discharge or continuous overcharge
batteries (Table 51.34). conditions. Eagle Picher also supply an NC series of
The battery-charger systems are designed to pro- rectangular transistor batteries (Table 5 1.38).
vide the economy, convenience and long life of Typical discharge curves for the ZA, Z2A, DA and
nickel-cadmium sealed cells for a wide variety of VA series of button cells are shown in Figure 51.24.