1. 
   AA battery
   An AA battery is a standard size of battery. Batteries of this size are the most commonly used type of in portable electronic devices. An AA battery is composed of a single electrochemical cell. The exact terminal voltage and capacity of an AA size battery depends on the cell chemistry. The AA batt...
   Found op http://en.wikipedia.org/wiki/AA_battery
   
   
2. 
   AAA battery
   A triple A or AAA battery is a standard size of dry cell battery commonly used in portable electronic devices. A carbon-zinc battery in this size is designated by IEC as "R03", by ANSI C18.1 as "24", by old JIS standard as "UM 4", and by other manufacturer and national standard designations that va...
   Found op http://en.wikipedia.org/wiki/AAA_battery
   
   
3. 
   AAAA battery
   The AAAA battery (usually read as quadruple-A) is 42.5 mm long and 8.3 mm in diameter. The alkaline cell weighs around 6.5 g and produces 1.5 V. This battery is also classified as LR8D425 (IEC) and 25A (ANSI/NEDA). The battery is also known by its Duracell type number MN2500 or MX2500 and Energizer...
   Found op http://en.wikipedia.org/wiki/AAAA_battery
   
   
4. 
   aabattery
   1) A pocket radio might have one 2) Remote power source? 3) Smallish energy source
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/aabattery/1
   
   

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