[en] The charge-exchange cell forming a part of the lithium-diagnostic beam-line on Pulsator, Wendelstein 7a and ASDEX is described. The cell consists of a neutralization tube of 12 cm length attached to a reservoir which supplied the neutralizing medium, either lithium or sodium. To reduce cell losses, operation is on a pulsed basis by means of a valve which seals the reservoir during periods when the beam is not on. Using sodium, neutralization efficiencies for a Li⁺ beam vary typically from C.97% at 20 keV to 57% at 100 keV. (orig.)