Specification Ultra High Power Rechargeable Battery Pack for RC Transmitter (TX) Unit - Instant Range.Vapex high quality Instant Flat 8 batteries maintains up to 80% of it's charge after 6 months with up to 70% still available after 1 year. Because of this useful characteristic, Instant are supplied charged and ready for use straight from the pack.Environmentally friendly, contains no Cadmium and less cobalt than conventional NiMh batteries.These batteries give around 3 times the capacity (& hence running time) of most NiCd types, without any of the memory effects. This means that they can be recharged even when not fully drained, i.e. you can just "top them up"This power pack is ideal for all manner of radio control receivers and transmitters. RC Transmitter (TX) Unit