Battery and Charger
MERGE 11-14
Chapter 11
Battery voltage
1 2 3 4 5 6
Battery condition
7.00V 7.00V 7.00V 7.00V 7.00V 7.00V Very good
7.07V 7.07V 7.22V 6.50V 7.07V 7.07V
The service life of batter No 4
is to expire.
7.20V 7.20V 6.67V 7.33V 6.27V 7.33V
The service lives of battery No
3 and 5 are to expire.
3. The battery pack of which the discharge time is less than 60 minutes during the discharge test
under 78℉ (25.6℃) usually cannot sustain a vehicle shift. However, the discharge time is
dependent on the temperature of the electrolyte. The table below shows the discharge time under
different temperatures of the battery pack of which the discharge time exceeds 62 minutes under
80℉ (26.7℃).
Battery troubleshooting example
Below is the battery troubleshooting example.
Example 1:
Due to the poor performance of the electric vehicle and the battery is suspected to be the cause, the
battery charger is inspected. When the battery is fully charged, the reading on the ammeter of the battery
charger is 8.0A. The charging voltage inspection is conducted and the results are recorded.
Battery number
1 2 3 4 5 6
Charging voltage 10.15V 10.60V 9.80*V 10.16V 10.56V 10.61V
*As battery No. 3, No 1 and No 4 are suspected to have problems, hydrometer inspections are
conducted on all batteries.
Electrolyte temperature
Discharge time when
the shut-off point is
reached
Electrolyte temperature
Discharge time when
the shut-off point is
reached
40-49℉ (4-9℃) 40 minutes 85-89℉(29-32℃) 64 minutes
50-59℉ (10-15℃) 45 minutes 89-99℉(32-37℃) 66 minutes
60-64℉ (16-18℃) 50 minutes 100-109℉(38-43℃) 68 minutes
65-69℉ (18-21℃) 54 minutes 110-119℉(43-48℃) 70 minutes
70-74℉ (21-23℃) 57 minutes 120-129℉(49-54℃) 72 minutes
75-79℉ (24-26℃) 60 minutes 130-150℉(54-66℃) 74 minutes
80-84℉ (27-29 )℃ 62 minutes ***** *****
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