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Why do the D A M window cleaner instructions say to use my hand to scrub the window?

Scrubbing the window with your hand is most effective as the cleaner is not being absorbed by a rag. This process gives the cleaner time to soak into the bugs and dirt while distributing the cleaner evenly. A very small rag wet with the cleaner or a VERY SOFT bristle brush also works well. Wash your hands after you are done.

Why not use paper towels on my aircraft windshield? They seem to work great!

Aircraft windshields and windows are made from a hard durable MIL standard acrylic plastic that has a long service life. However, they are still plastic and can be damaged if not cleaned properly. Aircraft windshields and windows are not only expensive, but changing them takes a lot of expensive labor. Paper towels are made from a matrix of processed wood fibers that can be hard enough to scratch plastic. Paper towels will not damage the acrylic every time they are used, but consistently using them will eventually give you little fine scratch defects that refract light differently than an adjacent smooth surface. The small differences in light refraction will obstruct and distort your view.  

Dust is made up of many little abrasive particles so it is important to isolate the dust particles from the windshield as you wipe. The softer and more expanded the cloth material is, the greater the tendency for the cloth to absorb the dust particles isolating them from the cloth surface. In other words, the dust particles can go deeper into a soft fiber matrix as compared to a harsh hard fiber matrix of paper towels. Dust and dirt particles tend to collect on the hard paper towel surface giving it a sandpaper effect. Gently feel a paper towel surface. Gently feel a T-shirt or micro fiber cloth. The surface hardness is very noticeable. 

In summary, there are really two differences in a paper towel and a soft fiber cloth. One difference is the hardness of the actual fiber and the second is the ability of the fiber matrix to absorb dust particles away from the fiber surface. 

I bought door cables that have small holes in the rubber coating. Is this normal or are the cables damaged?

The small holes are normal as they are part of the manufacturing process.

Are lithium batteries safe?

Since inception in 2009, EarthX has designed their lithium batteries with a micro-processor-controlled battery management system (BMS) to provide safety and performance features for your battery.  EarthX is not new to providing lithium iron phosphate batteries. Over the past 13 years, has become the most trusted and used lithium battery in the experimental aircraft market and by working closely with OEM’s and engine manufacturers a like, this BMS has been developed to be one of the most reliable in the industry. EarthX is not only the exclusive provider for the Indy Race Cars, but EarthX is also the first company in the world and in history to have an FAA TSO certified aircraft battery as a testament to the safety and quality of the batteries.  

Features of the BMS protection:

• Cell balancing
• Low voltage protection
• High voltage protection
• Excessive Cranking Protection (Heat)
• Short circuit protection
• In the Hundred series, an alert LED fault light to communicate an issue on battery itself or can be remotely monitored with a 12V LED
• In the Hundred series, the BMS board is redundant so there is no single point failure

Battery design safety features:

• Proprietary battery case design with recessed terminals to protect from short circuiting
• Clam shell design with terminals down the center so polarity (installation) is never an issue
• Flame retardant plastic housing
• The state of the art ceramic cell separators to reduce the risk of thermal runaway by 400% over standard lithium cell separators.

Performance design features:

• The widest operating temperature range available
• A rated cells that must meet stringent testing requirements
• True industry standards testing specifications

Can I hook an EarthX battery in parallel or series with a lead acid battery?

No, the voltages are not the same and you will over charge the lead acid battery and drain the lithium.

Can the battery be installed in any position?

Yes, lithium battery can be installed in any position for they are a dry cell technology.

How do I know if my battery charger is working?

The new fully automatic chargers on the market today need to be hooked up to a battery before they will output any voltage. This is primarily a safety feature that prevents spark when hooked up, and protects the charger against reverse polarity hookup. Some chargers need to see as much as 9V volts before they recognize that they are attached to a battery. Once the charger is hooked up, it should output 13.9-14.6 volts. If your charger does not do this, you may want to contact the manufacturer for further troubleshooting tips.

How do I know when it is time to replace my (LFP) lithium battery?

All battery types lose power and capacity as they age. The rate of when this happens depends on the maintenance of the battery and how it has been used (or abused).

• If you notice your battery just doesn’t have the same “umph” as it used to, it might be time to replace it.  In the cold this issue is more prominent.
• If you notice the battery is “swollen.” As the battery ages, gases can build up inside the battery and make the battery look bulging or swollen. The gases are not dangerous or have any safety issue, but the pressure can puff the case.
• If the battery is left in a discharged state and then very quickly charged, the cells can puff causing the case to look bulging.
• The battery will not hold a voltage above 13.28V for the 12V vehicle applications or 26.56V for 24V vehicle applications.
• The fault light is solid or flashing on the battery models that have the LED alert and is consistently on for days.

How long should I wait in between failed start attempts?

Cranking should be limited to 10 seconds within any 1 minute period. Most starter manufacturers also recommended less than 10 seconds of cranking in any 1 minute period. 

How long will my battery last?

4-6 years is the average lifespan, however they can last longer depending on how they have been maintained, the quality of the charging system and the enviroment used in. 

How much do I tighten the screws for installation?

Tighten the screws to 35 in-lbs. If you don't have a torque wrench then use a screwdriver to tighten firmly (one handed). If you over torque the screws, you will damage the BMS board or loosen the nut.

How often should I charge the battery?

Only when needed which is when the voltage reads below 13.28V. It depends on the battery model (the larger amp hour batteries will need less topping off than say the scooter battery) but if not in use or left in a vehicle, make sure you check the voltage and charge at least once a year. Due to lithium batteries extremely low self-discharge rate, less than 50% of its charge is lost over a 6 month period, so you may not have to charge your battery before the season starts! If the battery is 13.28V or higher, then all is good. If it is less than this, you need to charge it before engine start to ensure a long battery life.

I just installed my EarthX battery in my aircraft and started the engine and my charging amps was really high, is this normal?

Yes, this is normal. A lithium battery can and will accept a much higher charging current than an equal size lead acid battery. If your battery is not fully charged, your alternator can potentially output a current equal to or slightly above the alternator’s rating for a few minutes to top the battery off. Your fuse, breaker, or current limiting device should be sized approximately 20% above the alternator rating. Example, if you have a 40 amp alternator, use a fuse, breaker, current limiter set to 48 amps (or 50 amps).

Is it safe to hook up the battery to a charger and walk away?

No. As with any battery being charged it is best not to do this in the event of a faulty charger. Follow these safety tip for charging ANY type of battery.

• Never leave the battery or the vehicle unattended when recharging it.
• When charging a battery, place it on a non-flammable, and remove any flammable items nearby.
• Unplug chargers from the battery or vehicle always after the battery reaches full charge.
• Disconnect chargers when not in use.

My LED light is flashing on my ETX680C/680, ETX900, or ETX1200, what does that mean?

Most of the time, it means you need to charge the battery as it is at a low charge level but it could mean several things. First thing you need to do it put a voltmeter on the battery, if the voltage is less than 13.28V, the LED light will flash to let you know to charge the battery. If the voltage is above 13.28V and flashing, then you could have a weak cell /a cell out of balance/or defective cell and you need to contact EarthX for a warranty coverage if it is less than 2 years old. The LED will also flash if the voltage is too high, above 14.6V. If the light is solid and remains on for more than 10 minutes, then it is an indication of a BMS electronics problem and contact EarthX.

My battery is dead or near zero volts, how do I recharge it?

The ETX-Series of batteries have over discharge protection and is designed to prevent a continuous active drain on the battery to the point of damaging the battery, such as leaving your key in the on position, master switch on your aircraft, or parasitic draw as examples.  If your battery is reading 0V, or near 0V, then this protection might be activated.

To determine the actual voltage of the battery, remove the negative battery cable and measure the voltage at the terminals with a voltmeter.  If less than 8V, it will not accept a charge.  Once a lithium battery is approximately 8V, it can be permanently damaged and the EarthX BMS is designed to not allow the recharging of the battery as this is no longer safe to do and can be dangerous and cause cell rupture.  Never force a charge into the battery. This is not a battery defect, nor a failed battery, but instead the protection working as it is designed.

The rate of discharge depends on how many amp hours the battery has (less Ah = faster discharge) and the ambient temperature (warmer = faster discharge).  When the EarthX battery is about 95% drained, the BMS over discharge protection will disconnect the battery from the active drain so that you do not continue to discharge the battery to the point of damaging it. You know this has happened when you put a voltmeter on the battery installed in the vehicle and it reads close to 0V. We allow this much discharge of the battery to provide you the most energy possible if the drain is intentional, ie: your alternator fails in flight, and you are powering your electronics with the battery. The battery will continue to drain, at a much slower rate, with time as this is impossible to stop batteries from self-discharging.  Even “brand new” batteries left in a box will drain and if not recharged and maintained, will be permanently damaged.

It is very important to recharge the battery immediately if it has been drained.  The longer the battery remains discharged will shorten the overall life span and increases the chance of permanent damage.

Depending on the amp hour of the battery and the environmental temperature will dictate how much time can pass before it is permanently damaged.  Example, the ETX12A is a 4Ah battery and should be recharged within a week whereas the ETX900 is a 15.6Ah battery and should be recharged within a month of finding it in this state.

The battery does not seem to charge or hold a charge, why?

If a battery does not seem to charge or perform as well as it once did, it may be for one or more of the following issues:

• There may be a problem with the charging system. While the charging system is in operation, it will begin putting out approximately 13.8 -14.6 volts.
• The vehicle electrical system may have a short circuit or current drain
• The terminals on the battery are not properly tightened
• There may be a problem with the battery itself so if you have verified that it is not a parasitic drain, and the battery is losing power within 1-7 days, then contact EarthX. Do not continue to attempt to charge or use a battery that will not hold a charge as it might indicated cell failure and continued use can cause cell rupture, smoke and even fire.

What is the difference between PCA and CCA?

Unlike Cold Cranking Ampere (CCA), the Pulse Cranking Ampere (PCA) rating does not have an “official” definition by the automotive industry. CCA tests are done at 0 deg F with a 30 second discharge time which is unrealistic for most motorsport vehicles. PCA is a measure of battery discharge amps for <10 seconds at 77 deg F (25 deg C). Our manual shows the CCA and PCA rating of each battery. The CCA rating is most important for snowmobiles due to the colder temperatures.

What is the shelf life or life span of a battery?

All batteries have a life span, even if left in the box and never used. Time is a factor even if properly cared for, eventually, all batteries die. An EarthX battery is rated for up to 6 years if properly maintained, which means it is not left in a discharged state (below 13.28V); used in a properly functioning charging system; used with a proper charger; not shorted; and proper temperature ratings have been followed. All batteries will self discharge and depending on the amp hour of the battery, and its temperature it is stored in, the level of discharge and amount of time are variable. Always keep your lithium battery above 13.28V for longest life.

What maintenance is required?

Lithium batteries require no maintenance such as adding liquid, worrying about freezing in subzero temperature, or the heat of summer damaging them. Just be sure the terminal connections are tight and free of corrosion. If you have a vehicle that has a drain even if the key is off, (Harley’s definitely do) then you will need to charge them every 1-2 months of inactivity (depending on how much of a draw there is determines the length of time it can sit) by putting a charger until it shows fully charged. If at any point your battery is less than 13.28V, it is in a discharged state and needs to be charged. Any battery left in a discharged state can and will be damaged or life shortened.