Download - Smith-Root

LR-20
LR-20B
BACKPACK ELECTROFISHER
&
Battery Care and Maintenance (cont.)
Life
Load
Capacity
20 hr
0.60A
12.0Ah
10 hr
1.05A
10.5Ah
5 hr
1.95A
9.7Ah
1 hr
7.20A
7.2Ah
30 min
12.00A
6.0Ah
BATTERY SPECIFICATIONS
Rating: Batteries are rated at the current which will reduce the
voltage per cell to 1.67 volts in 20 hours. The heavyweight battery
has a 12 amp hour rating. However its life at 100 watt continuous
would be only 120 minutes. As the discharge current is increased,
the efficiency and relative capacity decrease.
Fig. 7.5: Relative capacity of 12Ah deep
cycle battery.
Battery Life
Each time cycle a battery it loses some of its ability to take
a charge. Deep cycle batteries are capable of being charged
and discharged from 100 up to 1,000 times, depending on
the depth of the discharge and the type of charger used.
Service life and shelf life are both adversely affected by
warmer temperatures.
Fig. 7.6: Discharge curves for 12Ah and
7Ah batteries.
Battery Storage
3% to 6% per month. Storage temperature above
20°(68°F) should be avoided. Shelf life can be increased by
storing at lower temperatures, but store at above -30°C to
prevent freezing. Batteries should be fully charged before
storing and should be recharged every four months.
Fig. 7.7: Effect of temperature on
battery life.
Effects of Temperature
The temperature at which a battery is used also affects the
relative capacity of the battery. Figures 7.7 and 7.8 show
that in cold weather the shocking time will be less and the
battery will have less capacity.
Fig. 7.8: Effect of temperature on capacity.
21
www.smith-root.com