mostly about video camera batteries.
http://videoexpert.home.att.net/artic1/225cbat.htm
This article gives ideas on how to decide to either reuse the unregulated Wall Wart as it is, or not.
http://www.qsl.net/ke3fl/htm/WALLWART.HTM
It is intended to provide a starting point for those people that want to find out what they are, what they do, and what's available.
http://www.jetcafe.org/~npc/doc/ups-faq.html
modern portable systems require protection from an arsenal of potential overcurrent problems.
http://www.edn.com/archives/1996/050996/10df6.htm
based on the UniTrode UC3906 Integrated Circuit.
http://www.geocities.com/vk3em/sla-charger/sla-charger.html
describes how full wave rectification using four diodes works.
http://ourworld.compuserve.com/homepages/g_knott/elect207.htm
With portable applications on the rise, designers are turning to dynamic power-conservation techniques to delay the inevitable dead battery.
http://www.edn.com/article/CA189467.html
http://www.recherche.enac.fr/~puechmor/e_rectif/e_rectif.html