Charging batteries properly requires administering the right amount of current at the right voltage.

The original instructions for your charging equipment should be referenced for proper charging.

Here is list of helpful items to remember when charging your battery.

  1. Become familiar with and follow the instructions issued by the charger manufacturer
  2. Batteries should be charged after each period of use
  3. Lead acid batteries do not develop a memory and need not be fully discharged before recharging
  4. Charge flooded batteries only in well-ventilated areas. Keep sparks or flames away from a charging battery
  5. Verify charger voltage settings are correct for the type of battery you are charging (Flooded, AGM or GEL)
  6. Correct the charging voltage to compensate for temperatures above and below 25°C/77°F

Compensation for battery temperature above or below 25°C/77°F can be made by subtracting 0.005 volts per cell for each 1°C above 25°C or by adding 0.005 volts per cell for each 1°C below 25°C. Add .028 volt per cell for every 10° below 77° F and subtract .028 volt per cell for every 10° above 77° F.

  1. Check water level on flooded batteries (See Watering section)
  2. Tighten all vent caps on flooded batteries before charging
  3. Prevent overcharging the batteries. Overcharging causes excessive gassing (water breakdown), heat buildup, and battery aging in flooded batteries and will dry out the electrolyte and damage VRLA batteries
  4. Prevent undercharging the batteries. Undercharging causes stratification
  5. Do not charge a frozen battery; allow it to thaw at room temperature
  6. Avoid charging at temperatures above 50°C/125°F
General Lead Acid Battery Description
General Lead Acid Battery Applications
General Lead Acid Battery Types
General Lead Acid Battery Chemistry
Discover® Sealed Valve Regulated Lead Acid Batteries
Discover® Deep Cycle AGM Battery
Discover®700 Series Dry Cell Battery
Discover® EV Traction Dry Cell Battery
General Benefits and Features of Discover Valve Regulated Lead Acid (VRLA) Technology
Sales Channels for Discover Battery Technologies
Things to question when making a battery buying decision
What to consider when buying a deep cycle battery
Information gathering before buying batteries
Calculating cost to own when purchasing batteries
Safety First
Safety and Productivity
When working with batteries
When handling battery acid
When installing or replacing batteries
When booster cables are used
Danger of exploding batteries
Warning and warning labels
Parallel connections for sophisticated users and installers
Parallel connections for unsophisticated users and installers
When charging batteries
Selecting a charger
General charging information for AGM and GEL batteries
GEL battery charging
AGM battery charging
Equalizing (Flooded batteries only)
Typical self-discharge of VRLA batteries at different temperatures
Typical self-discharge of high quality deep cycle flooded batteries at different temperatures
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