Deep Cycle Battery
D-765
Millat Deep Cycle Flooded Batteries are
suitable for use where repeated charge
discharge cycles are required such as solar
energy systems, electric vehicles, golf carts,
etc.
These batteries are constructed with thick
plates of lead antimony alloy special
formulated paste and synthetic pulp
separators with glass mat.
Specifications
Type
Flooded Lead Acid
Weight Dry
15.4kg approximate
Volts
12 V
Electrolyte Volume
5.10 litre approximate
Electrolyte Density
1.260
Capacity
65Ah
20hr rate to 1.7V/cell at 30°C
after 10 cycles
No of cells
6
Dimensions (LXWXH)
304X170X202
Terminal
L-Type with 8mm hole
Case Material
Polypropylene
Dimensions
Millat Industrial Products Ltd.
wwwmilatbatteries.com
22 July 2017
Deep Cycle Battery
D-765
Charging
New Deep cycle batteries need to be cycled several times before they reach their full capacity,
approximately 10 cycles. Capacity will be limited during this period. New batteries should be given
full charge before use.
Selection of correct charging parameters is one of the most important parameters for ensuring long
life and trouble free operation. Following a discharge the battery should be immediately charged in
a well ventilated area.
Depth of Discharge
The life of a battery, measured in number of charge discharge cycles, depends on how deeply it is
discharged before recharging (depth of discharge). Battery should not be discharged beyond 80%
of its capacity otherwise it will lose some of its capacity permanently. Repeated discharge beyond
80% of capacity will result in extremely low life. For optimum life and performance batteries should
be used at 40%of their capacity up to 1.200 specific gravity. Depth of discharge can be
approximately measured by checking the specific gravity of the battery.
Capacity Percentage
Specific Gravity
at 30 oC
100%
1.260
80%
1.230
60%
1.200
50%
1.190
40%
1.170
30%
1.150
20%
1.135
0%
1.095
Operating temperature
Operating batteries at high temperature shortens their life. Charging should be stopped if
electrolyte temperature exceeds 50°C it should be resumed again after the temperature drops
below 40°C. Batteries should be kept in a cool and well ventilated area.
Charging with Constant Voltage
Batteries should be charged with a constant voltage of 14.4V with the charging current controlled
at 11A. With this method charging current will be maintained at 10 A until the battery voltage rises
to 14.4 volt after which the current will start to decrease and the charger will keep the voltage
constant at 14.4V. Charging should be stopped after the current has reached 1% of its rated
capacity (0.7Amp for D765)
Equalisation Charge
To ensure that all the cells/batteries are at the same charge level in a battery bank it is
recommended that the batteries be given an extended charge at 14.6 V for 2 to 3 hrs once a
month.
Millat Industrial Products Ltd.
wwwmilatbatteries.com
22 July 2017
Deep Cycle Battery
D-765
Float Charge
Maintain battery at a voltage of 13.8V for keeping it charged and ready at all times.
The above voltages are at battery temperature of 25°C. For temperatures above 25°C reduce the charging
voltage by 15mV/°C and increase the voltage by 15mV/°C for temperatures below 25°C
Maintenance
Electrolyte level of the battery should be maintained by adding distilled / De-Ionised water only.
Electrolyte should be added only after the battery has been fully charged. Adding too much water
(above the max level) will deteriorate battery performance. Too little water (below the min level) will
damage the battery.
Terminals and cables should be cleaned regularly. Slightly grease the terminals to prevent
corrosion.
Keep top of battery clean and dry.
Discharging Characteristics 13
12.00
8.00
6.00
4.00
Current 10.00
12.5
Terminal 15.00
14.50
14.00
13.50
13.00
12.50
12.00
11.50
11.00
10.50
10.00
12
11.5
11
10.5
C5
C10
C20
2.00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
18.4
10
0.00
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
Voltage(V) Constant Voltage Charging at 14.4V
Max Current 11.2amp
Discharging Time Time (hrs)
Safety Precautions
1. All lead-acid batteries generate highly flammable Hydrogen gas. If ignited, the gas may
explode violently. When working near batteries, always wear safety glasses, do not smoke or
use open flame near the batteries, remove watches and jewellery and avoid causing sparks
with tools.
2. Battery electrolyte is corrosive and can cause blindness or severe burns. If exposed to battery
electrolyte, immediately flush with water and seek medical attention.
3. The batteries in your equipment are electrically live at all times. Keep the top of the batteries
clean and dry to prevent ground shorts and corrosion.
4. Do not tip a battery in any direction excessively. This would allow battery electrolyte to push
through the battery vent assembly.
Specifications subject to change without notice
Millat Industrial Products Ltd.
wwwmilatbatteries.com
22 July 2017
Deep Cycle Battery
D-765
Millat Industrial Products Ltd.
wwwmilatbatteries.com
22 July 2017