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IMOH the ONLY batteries to use in an aircraft are the sealed, gas recombinant
types (not to be confused with gelled electrolyte or Gell Cells). These
batteries were designed for use in computer UPS applications and have several
advantages in aircraft. First, their electrolyte is immobilized so you could
drill a hole through one and nothing would come out. Second, they can be
mounted in any position. Third, they have very low internal resistance and
will therefore produce higher cranking currents for those cold mornings.

The batteries I use are manufactured by Matsushita (one of the world's largest
battery manufacturers) and distributed by Panasonic. They are sold
domestically by several companies but I would recommend B&C Specialty, 316 283
8000. I have a 28-volt system (on my IV) so I installed two 12v, 17 Amp Hour
(AH) batteries in series. I also used a B&C linear voltage regulator with
crowbar protection and a B&C starter and alternator. One 24 AH battery should
be plenty for a 12 volt system on a IV and a 17 AH would do the job on a
200-360.

This starter and battery combination will crank the engine at 200 RPM and has
never failed to start, even in hot start conditions.

Crank it up!

Brent