Trickle charging means charging a fully charged battery under no-load at a rate equal to its self-discharge rate, thus enabling the battery to remain at its fully charged level. A battery under continuous float voltage charging is said to be under float-charging.
For lead-acid batteries under no-load float charging (such as in SLI batteries), trickle charging is achieved naturally at the end-of-charge, when the lead-acid battery takes in a trickle charge to keep itself fully charged. The trickle charging then equals the energy expended by the lead-acid battery in splitting the water in the electrolyte into hydrogen and oxygen gases. Other battery technologies, such as the lithium-ion technology, are highly intolerant to over-charging, and cannot be float-charged without an external battery management system.
See also 
- General Electric Company; General Electric Company. Publicity Dept (1934). General Electric review. General Electric Co. Retrieved 12 January 2012.
- George Wood Vinal (December 1955). Storage batteries: a general treatise on the physics and chemistry of secondary batteries and their engineering applications. Wiley. Retrieved 12 January 2012.
- InfoWorld Media Group, Inc. (28 August 1989). InfoWorld. InfoWorld Media Group, Inc. p. 29. ISSN 01996649. Retrieved 12 January 2012.
- David Anthony James Rand (24 February 2004). Valve-regulated lead-acid batteries. Elsevier. p. 258. ISBN 978-0-444-50746-4. Retrieved 12 January 2012.
- Thomas Roy Crompton (11 May 2000). Battery reference book. Newnes. p. 47. ISBN 978-0-7506-4625-3. Retrieved 12 January 2012.
- Henk Jan Bergveld; Wanda S. Kruijt; Peter H. L. Notten (1 November 2002). Battery management systems: design by modelling. Springer. p. 171. ISBN 978-1-4020-0832-0. Retrieved 12 January 2012.