Frequently Asked Questions about replacing ‘boat anchor’ lead batteries with a lightweight Lithium aircraft battery.
This section will expand as readers ask more Q’s


Aerolithium Batteries


Sizing & Compatibility

  • What about CCA and PCA ratings?
    • Cranking Amps (CA) and Peak Cranking Amps (PCA) are generally interchangeable when rating batteries.  They are a measure of the battery’s output at standard temperatures, i.e., above freezing.  CA indicates the amperage delivered at 32° F for 30 seconds while maintaining a minimum of 7.2V (for a 12V battery).


      CCA, on the other hand, is specific to lead-acid batteries.  It measures the same thing at 0° F, as colder weather reduces their output significantly.

  • I have fuel injection / electronic ignition….
    • Yes, you NEED a backup battery. Lithium is perfect for that.

  • My aircraft is certified. What about that?
    • These Lithium aircraft batteries are not certified but could be used as a back up  emergency starting battery for certified aircraft.

  • How can such a small battery run my lights, etc.?
    • It doesn’t, the alternator provides the power for those.

  • What size battery does my homebuilt, helicopter, experimental, LSA need?
    • That depends on the current needed by the starter when cranking the engine.

  • I also have a jetski, ATV, yacht, motorcycle…
    • All can benefit from a Lithium battery replacement.  Contact us to discuss.

  • Mount in any position?
    • Yep, upside down is a good one; your friends will be impressed! Zip ties work best.

  • How do I estimate size battery I need?
    • Different starters pull a range of current to start the engine on hot days and cold days. This will determine the Ah size pack you need.  Ah size determines the price.  If you have a clamp-on ammeter, simply put it around a battery cable and turn the engine over; you will read the actual amps required.  most engines are known now.

  • Different shapes? I’ve never heard of that before.
    • Yep, flat and wide, tall and thin, etc…custom order available.


      The key is that your lithium battery fit within the space available.  Since a lithium battery will be much smaller than a comparable lead-acid battery, consider the latter to be the max dimensions you are working with for sizing a lithium battery.


Care & Usage


The Competition

  • I’ve seen other lithium batteries for 1/2 the price… why not get those?
    • 1st, they are made for powersports use; motorcycles, ATV’s, snowmobiles, etc. and their warranty does NOT apply to aircraft use. neither do they authorize resellers to sell them for aviation uses. (there is one that puts a different sticker on the orange case.) 2nd, the internal connections are smaller wire/copper braid made for starting small engines. Lastly, the CA and AH #’s given are totally false.



List of starter amp readings from various aircraft engines:
PISTON Battery needed
HKS 700E – 60Hpwr – 125amps 225A (4.5 Ah unit)
Rotax 582 – 65 Hp –  137A 225A (4.5 Ah unit)
Rotax 503 – 52 Hp – 153A 225A (4.5 Ah unit)
Rotax 912 & above – 240A 400A (8 Ah unit)
Hirth 2704 – 55 Hp – 167A 225A (4.5 Ah unit)
Cont. O-190 – 75Hp –  175A 360A
Lyc. I O – 360-200HP – 350A 440A
Lyc. I O   540, Cont. 470 / 550 800A
Cont.  550 – 24V 400A (8 Ah unit)
V W engine 400A (8 Ah unit)
TURBINE Battery needed
Solar T-62t – 32 550A
std T-62t 440A
Allison / RR M250 440A
PT6  all models 700+A

Quality & Safety

Quality of Aerolithium Materials

Cells – Lithium Iron Phosphate (LiFePO4)
Terminals – Copper or Brass
Enclosure – aluminum case; shapes to fit your needs
Warranty – 2 year prorated
Discharge graph – lithium’s flat power curve beats lead acid
Operating temps – minus 20 to 65 Celsius
Electronics – Balancing circuit standard as well as lithium balancing charger
Voltage – 14.4 and 28.8 systems, 10V to 14.5V operating range
Self-discharge – < 5% per year
Specific energy density – 118wh/kg


LiFePO4 Safety information

Many still think that all Lithium batteries are the same, unstable technology.  And there are major PbAcid battery mfr’s putting out downright false information.

If you don’t live, eat and breath lithium… all you know is what you read. So, here is some reading material to get you on the right track:

Charging System Basics

An engine’s electrical system is said to be a 12 volt system, but this is slightly misleading. An aircraft’s charging system will generally produce a voltage between 13.5 and 14.4 volts while the engine is running. It needs to generate more voltage than the battery’s rated voltage to overcome the internal resistance of the battery. This may seem strange, but the current needed to recharge the battery would not flow at all if the charging system’s output voltage was the same as the battery voltage. A greater difference of potential (voltage) between the battery’s voltage and the alternator’s output voltage will provide a faster charging rate.  Thus, a Lithium battery will draw less charging current and charge quicker than the typical sealed (or older wet cell) lead acid aviation battery.

Parasitic Drain Info – MUST read before installing your new lithium battery!

A good way to know what cranking amps your starter needs to start engine; use a clamp-on ammeter around a battery cable.

PowerPoint presentation on using LiFepo4 batteries.

Who We Are

Aerolithium is the only high-tech company specializing in custom design and development of lithium batteries for the Aviation and Aerospace industry.

Our proven lithium power solutions for Defense and Aerospace systems enhances performance, reliability and mission success.

Serving General aviation, Experimental designs, Commercial and Military clientèle worldwide.