20 is shown in fig1 system 20 includes a rechargeable battery 22 a source 24 and an adapter 26 fig1 is an exploded perspective view of the components of the system when assembled for charging the charge current source 24 is comprised of a conventional high impedance center tapped transformer which is illustrated schematically in fig8 by block 24 two blades 28 30 are provided in one face of the charger housing for connection to a source of 120 vac source 24 is available commercially from the assignee general electric company under the designation bc3 miniature charger and is described in the above identified u s pat no 4 009 429 as shown in fig8 the source 24 comprises a transformer 32 to make available from the standard 110 120 volt cycle ac line an output current of appropriate magnitude for the load provided terminal 34 is centrally tapped to the secondary of transformer 32 while terminals 36 and 38 are end tapped to the secondary of the transformer as shown in fig1 terminals 34 36 and 38 are one way snap type 34 male 34 terminals attached to a face of source 24 rechargeable battery 22 fig2 includes a generally rectangular shaped housing 40 which is open at one end and closure end plate 42 which may be formed of an insulating plastic material such as.