We're dedicated to making the most reliable batteries on the planet. But we understand that things happen, so if anything is wrong with your product, we'll work to make it right with our 1 year limited warranty.  

Any product(s) damaged in shipping (when ordered from ExpertPower Direct) or defective product(s) must be returned directly to ExpertPower in the original box or adequate cardboard packaging, using our prepaid shipping label. The Return Authorization Number (RMA#) must be included with the product.

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We want to get you your batteries as quickly as possible, which is why we make every effort to process your order quickly so you can get your system or gear up and running right away.

ExpertPower offers free USPS Shipping on every order regardless of purchase price. Valid in the contiguous United States (excludes HI & AK)

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Sealed Lead Acid (SLA): 13.8V or 2.3V per cell (6 cells) / 300 - 500 charging cycles

Cheap short-term: Upfront cost is lower but the average cost per cycle of an AGM battery is $.92

Charging: Any type of standard SLA charger can be used making them more user-friendly

Series/Parallel: All SLA batteries are compatible with series/parallel setups

Self-balancing: SLA cells balance themselves out due to the nature of their chemical structure

Drop-In: SLA batteries are simple and can be dropped in with no extra precautions

  Lithium Iron Phosphate (LiFePO4): 14.6V or 3.65V per cell (4 cells) / 2500 to 7000 charging cycles

Cheap long-term: Upfront cost is high but the average cost per cycle is $.27 

Charging: LiFePO4 requires a LiFePO4 charger (see ‘Why can’t I use an SLA charger?’)

Series/Parallel: The internal battery management system must be able to support series/parallel setups

BMS: LiFePO4 requires a battery management system (BMS) to protect their delicate internal structure

Lightweight: LiFePO4 utilizes materials that aren’t as dense as lead acid making them easy to move around

Learn more HERE!

The following is clarification on charging a sealed lead acid battery (SLA) vs the LiFePO4 battery, and why the BMS can't protect a LiFePO4 from SLA charging damage.

First, let's touch on the charging characteristics as both batteries have unique charging processes that take full advantage of their chemistries thus maximizing lifespan and performance!

- SLA: Typical lead acid batteries have a full charge voltage of 13.8 volts or 2.3V per cell (6 cells). SLA cells have the unique property of balancing themselves out. As such, lead acid chargers just need to provide a voltage higher than battery's voltage to bring the battery to its maximum state of charge (13.8V).

- SLA chargers: Most lead acid smart chargers provide 3 stages of charging: bulk, absorption, and float-- each with their own respective function. (Keep the float stage in mind, I’ll get back to this in a bit)

(Float charging keeps a lead acid battery at 100% state of charge as they have high self-discharge rates)

Voltages are unique to each type of battery as their chemistries have differing energy densities.

- LiFePO4: LiFePO4's voltage sits at 14.6V or 3.65V per cell (4 cells). An SLA charger will read 13.8V from this battery when discharged and think it is fully charged when in it is not, leading to disappointing capacity. Some chargers may even bypass the bulk and absorption stages and keep the battery float charging which basically means it won’t even charge since the charger thinks the battery is 100%! Keep in mind, some SLA smart chargers perform equalization of the battery's cells which will damage the LiFePO4's cells as well!

- LiFePO4 chargers: Chargers for LiFePO4 perform 2 stages called "Constant Current/Constant Voltage" (CC/CV). A preset current charges the battery up to a preset voltage then the current lowers as soon as it hits that preset voltage up until it reaches a 100% state of charge (14.6V). The BMS can't protect a LiFePO4 battery from an SLA charger because keeping a LiFePO4 battery at 100% through float charging isn't necessarily harmful in the short-term, but in the long term it will speed up aging of the cells as their activity is constantly stimulated due to the extra power coming from the SLA charger. This extra stimulation leads to polarization (buildup of material where the electrodes make contact with the electrolyte) and electrolyte decay.

It's absolutely necessary to use the correct charging algorithm (CC/CV ; 14.4V) as SLA smart chargers WILL NEVER fully charge a LiFePO4 battery or charge it ADEQUATELY enough to provide maximum lifespan and efficiency. Too much charging voltage for too long and you risk breaking down LiFePO4's internal electrolyte, too much charging current for too long and you shorten the lifespan of the cells.   

Most of our batteries come with no less than 75% of charge. We recommend to discharge the battery no less than 50%. This principle will give you a longer life span for the battery. 

If you know your battery's voltage, you can know what type of charger you will need. A 12v battery requires a 12v charger and a 6v battery requires a 6v charger.

The amperage of the charger should not exceed 20% of the battery’s amperage (e.g. 12v 20ah battery = 12v 4ah charger)

A helpful feature that most chargers have is the ability to automatically shut off once the battery is fully charged. Check the user manual for your charger to verify whether or not it has that capability. You will damage the battery by constantly charging it.

Depending on how the battery is charged and discharged, lead acid batteries generally last 3-5 years.

We recommend recharging every 3 months to preserve the lifespan of the batteries. 

At this time, the battery is not user replaceable. This is something we are currently looking into and hope to integrate into future versions of our Alpha generators.

All repair and replacement service must be completed by a certified ExpertPower technician.

We recommend recharging the Alpha generators every 3 months to preserve the lifespan of the batteries.

Yes, every Alpha model has a built-in solar charge controller to regulate the input voltage and current of your panel. (panel not included)

Promotional discount codes will be provided to those who are willing to test our products and provide feedback on their experience.

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