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Schumacher ProSeries 00-99-000742 User Manual

Page 13

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12

BATTERY PERCENT AND CHARGE TIME

This charger adjusts the charging time in

order to charge the battery completely,

efficiently and safely. The microproces-

sor automatically makes the necessary

decisions. However, this section includes

guidelines that can be used to estimate

charging times.
The duration of the charging process

depends on three factors:
1.

Battery State – If a battery has only

been slightly discharged, it can be

charged in less than a few hours. The

same battery could take up to 10 hours

if very weak. The battery state can be

estimated by using the built-in tester

(see page 10). The lower the reading

the longer charging will take.

2.

Battery rating – A higher rated battery

will take longer to charge than a lower

rated battery under the same conditions.

A battery is rated in ampere-hours (AH),

reserve capacity (RC) and cold cranking

amps (CCA). The lower the rating the

quicker the battery will be charged.

3. Charge rate – The charge rate is mea-

sured in amps. This charger provides

charge rates of 2A, 15A and 40A. The

125A rate is for engine start only. The

2A rate is for charging smaller batteries

such as those used for motorcycles and

garden tractors. Such batteries should

not be charged using the REGULAR

BATTERY setting. The 15A and 40A

rates are for charging larger batteries.

In the regular battery mode, the charger

begins at the 15A rate and increases

the charge rate if it is determined that

the battery can accept the 40A rate.

All charging modes will decrease the

charge rate as the battery approaches

maximum charge.

After the charging process has started, the

digital display can be used to determine

charging progress by selecting the BAT-

TERY % mode.

There are some important facts to keep in

mind when charging a battery.
• When the display indicates 77%

charged, the battery has been charged

enough to start most vehicles and has

already been charged as much as by

many other battery chargers.

• When the display indicates 85% charged,

the battery has already been charged at

least as much as by most other battery

chargers.

• The battery % shown in tester mode is

an estimate based on the battery voltage

and the Battery Council International

scale. The battery % shown in charger

mode is an estimate of the relative charge

in the battery compared to the charge it

should have if the charging process is

allowed to complete.

• The battery % shown in tester mode can

be used to estimate the relative charge

time. The lower the % shown, the longer

the charge time for a given battery.

• The battery % shown in charger mode

is an indication of the relative progress

of the charging process. The higher the

battery % displayed, the less charge time

remains.

• The more a battery is discharged, the

faster it absorbs charge from a charger.

That means that the battery % increases

faster at the beginning of the charging

process than at the end. In other words,

it takes longer for the battery to absorb

the last few percent of charge than the

first several percent.

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