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Denver Colorado Commercial and Industrial Battery Dealer, Distributor, Service, and Repair

BD Batteries Deep Cell Industrial
& Commercial Deep Cycle Batteries.

When you count on your Battery, count on BD Batteries.

About BD Batteries BD Battery Mission Contact BD Batteries Commercial Battery Home Page

Deep cycle Batteries

Crown Deep Cycle Batteries
- Crown Battery charging
- Flooded Battery Maintenance
Lifeline AGM Batteries
- AGM Battery Charging
Sun Xtender Batteries
- AGM Battery Charging

Battery Maintenance

Battery Maintenance Options
Flooded Battery Maintenance
Automated Watering
Automated Maintenance

Battery Chargers

Battery Chargers
Crown Industrial Chargers
C-Tek High Frequency Chargers
Xantrex Flexible Chargers

Battery Wires, Connections, and Lugs

Copper Battery Connection Wires
Battery Connections, Connectors, and Lugs
Custom Wire Rules

Battery Safety & Disposal

Battery Disposal and Recycling
General Battery Safety
Battery Connections & Charging Best Practices
Battery Lifting Best Practices

Terms, Policies & Conditions

Accounts / Credit / Etc.
No Ni-Cad Batteries

Lifeline & Sun Xtender AGM Battery Charging Recommendations

Lifeline and SunXtender Premium AGM Batteries are capable of fast charging like few other batteries. Generally you can charge these premium batteries at 5 times their capacity. You must maintain a stable voltage, but can run as many amps as you like under the 5x threshhold. For a 100ah battery, use no larger than a 500 amp battery charger, and be done in 15-30 minutes. Be careful with fast charging, overcharging results in premature battery failure.

Here are the manufacturers specifications for charging voltages, for each of the disparate charging phases:
Initial charge or recharge: 2.37 to 2.40 volts per cell at 25° C (77° F).
Float charge: 2.20 to 2.22 volts per cell at 25° C (77° F).
Equalize charge: 2.40 volts per cell at 25° C (77° F)*.
Temperature compensation = ±3.75 mV. per cell per degree C [Reference to 25° C (77° F)].
This is for battery temperature (not ambient temperature) and is useful for battery temperatures from 0° C (32° F) to 40° C (104° F).

Contact Concorde Battery Corporation for battery temperatures that exceed this range. *AGM Batteries are sealed by the manufacturer. These solar batteries are UL approved because of this seal. However, this design prevents the addition of water to your solar battery. An equalize charge is a deliberate boiling of the electrolyte under an overcharge condition to "FORCE" power back into the system. Although this may recover elder solar batteries, it may also run them out of electrolyte, rendering your bank of solar batteries useless. The manufacturer recommends you equalize your batteries only 2 times over their lifespan. We recommend that those two equalization processes are done in the last 1/3 of their life. Equalize once when the batteries have lost 1/2 of their capacity (2/3 of the way through life), again when you think they are dead to wring a few more cycles from them.

Knowing when to recharge:

For maximum battery life in deep cycle applications, do not discharge the battery bank below 50%. Continually discharging the bank 100% will shorten the battery life. The open circuit voltages listed below approximates the various States of Charge (SOC).
DOD (%) 1 hr. Rate 8 hr. Rate 20 hr. Rate 120 hr. Rate
10 12.23 12.62 12.65 12.79
20 12.16 12.51 12.55 12.69
30 12.07 12.39 12.42 12.55
40 11.96 12.25 12.28 12.40
50 11.83 12.11 12.13 12.22
60 11.70 11.96 11.98 12.08
70 11.55 11.79 11.81 11.90
80 11.38 11.59 11.61 11.70
90 11.15 11.32 11.34 11.43
100 10.50 10.50 10.50 10.50
Please note that these voltages are averages and will vary slightly from battery to battery even of the same rating. They are, however, a good indicator of state of charge and can be used when setting low voltage alarms or disconnects for a Lifeline AGM battery. Other battery types or manufacturers voltage vs. DOD may be substantially different. The data is for newer batteries with relatively few cycles. An older battery will measure a lower voltage for a given DOD.

SOC (%) vs. OCV
the battery State Of Charge vs battery's Open Circuit Voltage

An easy method to estimate the State of Charge (SOC) of the battery is by measuring its Open Circuit Voltage (OCV). This measurement should be made after the battery has been at rest for a minimum of four hours with the battery shut off from its charging source and load. The voltage is listed as Volts/cell and for a 12V (6 cell) battery at 25°C (77°F).

State of Charge (%)OCV per cell OCV per 12V battery
100 2.17 or greater 13.0 or greater
75 2.10 12.6
50 2.03 12.2
25 1.97 11.8
0 1.90 or less 11.4 or less



Multiple Batteries:

If there is more than one battery in the battery bank, the following guidelines should be used:

  • Always use batteries of identical make, model and with the same manufacturing date.

  • Use no more than 3 strings of batteries in parallel configurations to ensure even charging.

  • Make sure the battery cable is not undersized for the battery system.

  • Make sure the battery cables are connected to the terminals correctly. If unsure, professional assistance is recommended
    • The Rocky Mountain`s Deep Cycle Battery Powerhouse!

    BD Batteries - Battery Warehouse in Denver Colorado
    525 East 70th Ave, Denver, CO 80229
    P: 303.800.4725 F: 303.600.9726

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    #138 5023 West 120th Avenue
    Broomfield, Colorado, 80020     		To purchase DOT exempt Battery products NOW! click here for our Retail Store.

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