Accessories
BA 151  | Rechargeable accupack as a spare, for use when the  | 
  | supplied accupack is being recharged.  | 
 L   | Charger for recharging two BA 151 accupacks  | 
  | (recommended when more than two stethoset receivers  | 
  | are used with one transmitter).  | 
RR 2400  | Additional stethoset receiver  | 
Rechargeable accupacks have a "charging cycle"
The charging time of the batteries depends on how long you have used your stethoset receiver. General rule:
Operating Time x 3 = charging time
Example:
listening: 1hr  | listening: 2 hrs  | listending: 3 hrs  | 
recharging: 3 hrs  | recharging 6 hrs  | recharging: 9 hrs  | 
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