A set of three AA rechargeable batteries and a charger unit that provides individual cell management including charge condition indicator, discharge cycling and 4 hour quick charge. The charger accepts 1 to 4 AA, 1 to 4 AAA or 1 to 2 9V blocks. It is provided with four interchangeable main adaptors suitable for 100 to 240Vac 50/60 Hz worldwide use. This external charging method allows instruments to remain in use while batteries are charged and, with the flexibility to quickly charge a variety of batteries, it is an asset to any busy instrument workshop.