As you already know  the primitive lead acid battery is going the way of the horse and buggy.
Energy storage  in a lithium battery has advanced to the point of being very safe; very lightweight, 1/4th or less the weight of a lead battery, a longer life span; thus cheaper than SLA over time.  
No battery tender required, higher resting voltage, higher cranking voltage / amps, cleaner,        no gassing / corrosion, less toxic and  environmentally much greener than lead acid.
Whether you have a Lycoming or Continental or Rotax or other engines.
Consider that a lithium replacement battery will last 5 times longer, and although costing about 2 x's more than a stock lead  battery, it pays off in the long run, while providing the benefits of lighter weight and smaller size. For those infrequent flyers, a charged lithium batt can sit for months and still fire up your engine.
Lithium lightweight airplane starting batteries are for those that want faster acceleration, increased useful load,  shorter takeoffs and landings, have weight and balance issues,  want less mass/ stress during hard G turns, no maintenance, install anywhere, and like being on the leading edge of technology.  
The Lithium Iron Phosphate chemistry of these batteries are non- hazardous, non flammable and non corrosive. Extremely small self discharge , no memory like NiCd, and can be serviced / refurbished if ever. These Lithium aircraft starting batteries are a retrofit unit that will work in ANY fixed wing aircraft, helicopters, light sport planes, experimental aircraft, LSA and gyrocopters.
Engines with fuel injection or electronic ignition are highly advised to have a backup battery installed.  See the presentation below given at Oshkosh 2012.

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Signature Services           About LiFePo4

  • Choice of Ah capacities
  • Custom sizes
  • Waterproof
  • Shockproof
  • Direct drop in replacement
  • Compatible w 12V / 24V charging systems and alternators
  • Dry cell, no acid, 
  • flat discharge curve
  • 2000+ discharge cycles
  • Higher average voltage
  • Safe, non volatile 
  • Environmentally friendly
  • 5 - 10 year usable life span
  • replaces lead at 1/4th the weight

P O Box 12942
Tallahassee  Fl 32317

Quality of materials
Cells - Lithium iron phosphate / LiFepo4
Terminals - Copper or Brass
Enclosure - Aluminum case
Warranty - 2 year pro rated
Discharge graph - showing flat power curve. This is why Lithium is  better than lead acid.
Operating temps - minus 20 to 65 Celsius
Electronics - BMS circuit standard 
Voltage - 14.4 and 28.8 systems

Self discharge - < 2% per year
Specific energy density - 118wh/kg

Will be at Sun n fun 2013
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How I lost 30 lbs in 2 minutes ! .. Let me show you how !
Charging System Basics:
    An engines electrical system  is said to be a 12 volt system, but this is slightly misleading. The charging system in most aircraft will generally produce a voltage between 13.5 and 14.4 volts while the engine is running. It has 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.

LiFePO4 Safety information;
Many still think that all Lithium batteries are the same.

If you don't live, eat and breath lithium... all you know is what you read. So, here is some reading material:
aviation lithium battery specs
a MUST read
Authorized Aerolithium Dealers;

experimental aircraft
lithium battery aircraft LSA ultralight
ultralight aircraft lithium battery