• Overview
  • Internal Battery View
  • Care and Maintenance
  • FAQ
  • Warranty

About U.S. Battery

U.S. Battery is the industry leader in manufacturing deep cycle batteries for a variety of purposes, such as: solar power, wind power, renewable energy, marine applications, energy storage, sweeping and scrubbing, and automotive applications.

U.S. Battery has been building flooded lead acid batteries since 1928 and has always put quality before quantity since their first day of production. U.S. Battery’s deep cycle products include: solar batteries, golf cart batteries, marine batteries, sweeper and scrubber batteries, AGM batteries, and sealed batteries.

U.S. Battery is extremely committed to standing behind their products, and they pride themselves in being one of the most family-oriented battery manufacturing companies in the USA.

Our American made batteries are the best quality, longest lasting, and the most dependable Energy Storage Batteries in the industry.

Our line is specific for: Solar, Golf Cart Battery, Marine, Renewable, Storage, Sweeper, Scrubber, Lift Access, Auto, Military, Electric Vehicle Conversion, 6 volt, 8 volt, 12 volt and many other applications where agm, sealed or deep cycle batteries may be needed.

Please keep U.S. Battery in mind every time you jump in your golf cart & tee up, shine a floor, start you next marine adventure, hook up solar panels, need a lift access ride to the top floor or when powering up your EV electric car.

Internal Battery View

U.S. Battery Internal View

Internal Battery View - Close up

U.S. Battery Internal View - Closeup

Care and Maintenance

  • New batteries should be given a full charge prior to first use.
  • New deep cycle batteries need to be cycled several times before reaching full capacity (50 – 125 cycles, depending upon type). Capacity will be limited during this period.
  • Battery cables should be intact and the connectors kept tight at all times. Always use insulated tools to avoid shortening battery terminals. Regular inspection is recommended.
  • Vent caps should be correctly installed and tight during vehicle operation and battery charging.
  • Batteries should be kept clean and free of dirt and corrosion at all times.
  • Batteries should always be watered after charging unless plates are exposed before charging. If exposed, plates should be covered by approximately 1/8” of electrolyte (add distilled water only). Check electrolyte level after charge. The electrolyte level should be kept ¼” below the bottom of the fill well in the cell cover.
  • Water used to replenish batteries should be distilled or treated not to exceed 200 T.D.S. (Total Dissolved Solids…Parts Per Million). Particular care should be taken to avoid metallic contamination (Iron).
  • For best battery life, batteries should not be discharged below 80% of their rated capacity. Proper battery sizing will help avoid excessive discharge.
  • Battery chargers should be matched to fully charge batteries in an eight hour period. Defective and unmatched chargers will damage batteries or severely reduce their performance.
  • Avoid charging at temperatures above 120oF or ambient, whichever is higher. Deep cycle batteries need to be equalized periodically. Equalizing is an extended, low current charge performed after the normal charge cycle. This extra charge helps keep all cells in balance. Actively used batteries should be equalized once per month. Manually timed charger should have the charge time extended approximately 3 hours. Automatically controlled charger should be unplugged and reconnected after completing a charge.
  • In situations where multiple batteries are connected in series, parallel or series/parallel, replacement battery(s) should be of the same size, age and usage level as the companion batteries. Do not put a new battery into a pack which has 50 or more cycles. Either replace with all new or use a good used battery(s).
  • Periodic battery testing is an important preventative maintenance procedure. Hydrometer readings of each cell (fully charged) give an indication of balance and true charge level. Imbalance could mean the need for equalizing; this is often a sign of improper charging or a bad cell. Voltage checks (open circuit, charged and discharged) can locate a bad battery or a weak battery. Load testing will pick out a bad battery when other methods fail. A weak battery will cause premature failure of companion batteries.
  • Always use a matched charger and battery pack system. Unmatched chargers will cause potential problems.
  • As batteries age, their maintenance requirements change. This means longer charging time and/or higher finish rate (higher amperage at the end of the charge). Usually older batteries need to be watered more often. And, their capacity decreases.
  • Lead acid batteries should be brought up to full charge at the earliest opportunity. Avoid continuously operating batteries in a partially charged condition. This will shorten their life and reduce their capacity.
  • Extreme temperatures can substantially affect battery performance and charging. Cold reduces battery capacity and retard charging. Heat increases water usage and can result in overcharging. Very high temperatures can cause “thermal run-away” which may lead to an explosion or fire. If extreme temperature is an unavoidable part of an application, consult a battery/charger specialist about ways to deal with the problem.
  • Inactivity can be extremely harmful to all lead acid batteries. If seasonal use is anticipated, we recommend the following:
    • Completely charge the battery before storing.
    • Remove all electrical connections from the battery, including series/parallel connectors.
    • Store the battery in as cool a place as possible. However, do not store in a location which will consistently be below 32oF. Batteries will self discharge when stored, the lower the temperature, the lower the self discharge.
    • When not in use, boost every 2 (two) months.

Frequently Asked Questions (FAQ)

  1. Question: How Do you charge USBMC deep cycle batteries?
    Answer: There are numerous correct ways to charge the batteries. Typically, charge at C % 10 amperes, (where C = the 20 hour capacity of the system expressed in Ampere Hours) until the battery voltage rises to 2.583 Volts per cell (i.e. 7.75 volts for a 6V battery). Hold this voltage constant for 2-4 hours and stop charging. A similar method would be to charge at the following upper limits and terminate the charge when the time limit is reached:
    • Charge Current = C % 10 Amperes
    • Charge Voltage = 2.583 Volts per cell
    • Charge Time = 10 Hours Battery temperature adjustment: reduce the voltage by 0.028 Volts per Cell for every 10oF above 80oF, increase by the same amount of temperatures below 80oF.

  2. Question: What is the float voltage for standby applications?
    Answer: 2.17 Volts per Cell adjustment for the temperature above.

  3. Question: What size battery do I need for my application?
    Answer: Determine how many amperes your application needs from the battery and for how long.
    • Multiply the two to obtain Ampere Hours required.
    • Increase this by 20% for a safety cushion, and from our capacity charts, match a battery which will deliver this many AH for the required time and voltage.
    • Connecting batteries in parallel adds AH, and connecting in series adds the voltage.
    • In either case the energy (WH) storage capacity is increased by the amount of energy each additional battery provides.

  4. Question: What is the cycle life of your batteries? Your competition says theirs last the longest?
    Answer: Any claims of lasting longer are based on selective data as a marketing gimmick (i.e. selecting the best of one and comparing it to the worst of the other) and is misleading. Battery life, like anything else, cannot be precisely pre-determined, any more than the life of your car or humans.
    • The actual life out in the field, when operated under identical conditions, is the only valid criteria.
    • One way to differentiate the life and performance is to look at the amount of materials, and the type of materials used in making the product.
    • U.S. Battery Manufacturing Company uses more of the life and capacity giving active material than our competitors. Plus the unique grid alloy and state of the art processing technology gives you the best possible life and performance.


U.S. Battery Manufacturing Company (USB) guarantees its products to be free of any manufacturing defects for a period of one-year. This limited warranty only covers defects in material and workmanship. The free replacement one-year period is calculated from the date code stamped on the battery. This limited warranty is non-transferable and the original proof of battery purchase is required. No labor or transportation expenses are included in this limited warranty. (US 1800 and all “E” line batteries carry a reduced six-month free replacement period). For RE Series warranty refer to separate warranty.

Any implied warranty of merchantability or fitness for a particular purpose shall be void and excluded subsequent to one-year from the date stamp on the battery. The replacement of the battery is the exclusive remedy under this written warranty or any implied warranty. U.S. Battery Manufacturing Company makes no other representation or warranty of any kind, and no representative, employee, distributor or dealer has the authority to make or imply any representation, promise, or agreement, which in any way varies the terms of this limited warranty. All batteries being submitted for warranty must be returned to the place of purchase or to a USB approved distributor for testing and evaluation. Onsite service would be available in most locations at an additional charge. Service charges will vary from location to location, distance traveled and number of batteries involved.

The provisions of this limited warranty shall not apply to failure due to:

  • Abuse or neglect such as improper fluid levels, loose wiring, or rusted or corroded hardware;
  • Lack of proper maintenance;
  • damage caused by improper installation of the battery;
  • neglect,
  • breakage,
  • freezing,
  • fire,
  • explosion,
  • wreckage,
  • the addition of any chemical,
  • operation of the battery in an overcharged,
  • or the operation of the battery in an uncharged condition (below half-charge – 1.200 specific gravity);
  • and a battery charged by systems other than those listed on USB’s "Approved Charger List" (list available upon request).


Warranty Limitations

U.S. Battery’s liability shall be to replace the defective battery. Replacement shall mean furnishing a new battery or used battery with sufficient life to complete the warranty term, which is incidental or reasonably equivalent to the warranted product at no cost to the purchaser during the replacement period. Damage not resulting from a defect in materials or workmanship or which occurs due to abuse or neglect (including failure to provide reasonable and necessary maintenance), transportation, accident or alteration is excluded from this limited warranty.