Page 598 - Battery Reference Book

Nickel-cadmium secondary batteries 51/35
Table 51.37 Rechargeable Carefree I1 sealed nickel-cadmium button cells, DA
and VA series, supplied by Eagle Picher
DA 280 VA 600
Nominal voltage (V) 1.2 1.2
Nominal rating (at 5 h rate) (mA h) 280 600
when discharging down to 1.OV at (mA) 56 120
Rating typical = 100% (mAh) 320 750
Discharge rate, rriax. (mA) 500 1500
Surge power (max. 2 s) (A) 3 8
Ri (charged, f = 50 cycles), approx. (ma) 80 30
Charge rate, max. (mA) 28 60
Charge time (recommended) (h) 14-16 14-16
Charge voltage (11) 1.3-1.5 1.3-1.5
Current for trickle charge, max. (mk) 2.8 6.0
Cell diameter, d, approx. (mm) 25 35
Cell height. h, approx. (mm) 9 10
Cell weight, approx. (8) 13.5 30.5
Battery diameter, D, approx. (mm) 26 36
Up to 10 cells may be connected in series to form a battery

Table 51.38 Rechargeable Carefree I1 sealed nickel-cadmium rectangular cells, NC series,
supplied by Eagle Picher
1604 NC 1605 NC

Nominal1 voltage (V) 7.2 8.4
Nominal rating (2.t 5 h rate) (mA h) 110 110
when discharging at (mA) 22 22
Rating typical = 100% (mAh) 120 120
Discharge rate, max. (mA) I65 165
Surge power (ma. 2 s) (A) I .5 1.5
Ri (charged, .f = 50 cycles), approx. (ma) 1200 1200
Charge rate, ma. (mA) 11 11
Charge time (recommended) (h) 14-16 14-16
Charge voltage (71) 9.1- 10.5 9.1 -10.5
Current for trickle charge, max. (mk) 1.1 1.1
Battery dimensions
(length x width x height), approx. (mm) 26 x 16.5 x 48.5 26 x 16.5 x 48.5
Weight, approx. (g) 34 40

and 51.43). Ever Ready also supply batteries made In general, and in agreement with the recommen-
up from standard single cell units to meet customers' dations of other suppliers of sealed nickel-cadmium
requirements. These cells operate over a wide tem- batteries, Ever Ready recommend constant-current
perature range and in a variety of unusual environ- charging methods for these cells. Constant-potential
ments such as gravity-free conditions or in a vacuum. charging will, because of the very low internal res-
The cells may be used or charged in any position. istance of these cells, lead to the drawing of very
For sintered cells the permanent temperature range high currents, with the possibility of overheating or
is -30 to +5OoC on charge and discharge, and for thermal runaway. These cells are also amenable to fast-
mass plate button cells the temperatures are 0 to 45°C charging methods and, when the application requires
(charge) and --20 to +45"C (discharge). The cells it, continuous charging can be used.
have a good charge retention characteristic, retain-
ing some 70% of capacity after lmonth's storage Yuasa (Japan)
at 20°C. The charge retention characteristics of mass
plate cells are significantly better than those of sintered The Yuasa hermetically sealed rechargeable. nickel-
cells. Charge retention is improved at lower tempera- cadmium alkaline batteries are largely produced in
tures. two types: the button type with pressed plates and the