Some battery types are not suitable for trickle charging. Lithium ion battery cells use a chemistry system which does not permit indefinite trickle charging. The millstream had slowed to a trickle. People continued to trickle out from hiding places. First a trickle and then a flood of players signed with Major League Baseball teams. At this point orders slowed to a trickle. Variable valve timing has begun to trickle down to marine engines. She had a thin trickle of blood running out of her mouth. A small trickle of tourists began to arrive, supplementing the salt-based economy. Although usually little more than a trickle in summer, in spate conditions it is impressive. British Commonwealth reinforcements continued to trickle into Malaya. After 1973, the number of ratifying states slowed to a trickle. His frustrations trickle down into confrontations with Lewis and Ted. The national fertility rate fell and immigration was reduced to a trickle. Reports of new species continue to trickle in from the field.