PP3 battery (can be referred to as E-Block/9V/6F22).
Rechargeable battery 9v PP3 200mAh NiMH Instance LSD Case Vapextech UK
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LLOYTRON NiMH Rechargeable AccuUltra Battery / 9V (PP3) Size / 250mAh / 1 Pack - B018
LLOYTRON NiMH Rechargeable AccuUltra Battery / 9V (PP3) Size / 250mAh / 2 Pack - B018
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10 Bay - Fast 9V Charger for 9v / PP3 rechargeable Batteries NiMh NiCd 1-2 Hour