The answer to the question depends on what you mean by it and what you are looking for - just a literature or news search or is it a practical search with "how to access" the item(s), or both, or something else. I have gathered some items before your question times out and hope something helps

If you mean more about that battery operated health device you saw, that is sold in your local pharmacy or home health center or online, you would need to check with your health professional about it - more info about that given below.
If you mean something that is brand new, maybe one research scientist or doctor somewhere that you heard of doing something unique then that would need more searching and it may be difficult to find whoever started that mention in the press if you don't have their name or institution but one possible research resource is linked at bottom for a start.
Here are a few items that may use a battery, the first is quite old from 1976 some are just excerpts:Powered walking machine prosthesis for paraplegicshttp://www.springerlink.com/content/cvln61483573q0j4/
An overview of the Levo range of stand-up wheelchairs (can't tell if a battery is involved here or they mean a battery of tests)http://www.ijtr.co.uk/cgi-bin/go.pl/library/article.cgi?uid=13621;article=IJTR_9_4_151_153
26 Lower-Limb Wearable Exoskeleton (for pdf version search in google.com and select scholar)http://66.102.1.104/scholar?hl=en&lr=&q=cache:XTthZSi73NUJ:hum.i-techonline.com/downloadpdf.php%3Fid%3D573+%22spina+bifida%22+battery+spine+walking
Comparison of Exoskeletons and Bionic Legshttp://ezinearticles.com/?Comparison-of-Exoskeletons-and-Bionic-Legs&id=1681761
Not for spina bifida but an experimental new discovery Honda hopes many can use:Honda's Robot Legs (not yet commercially available)http://www.robotliving.com/2008/11/11/hondas-robot-legs/Honda Unveils Experimental Robot Legs, Human Cyborgization Not Far Behindhttp://jalopnik.com/5079645/honda-unveils-experimental-robot-legs-human-cyborgization-not-far-behindMonday November 10, 2008Honda's Robot Boots Were Made For Walking, Standing, So Onhttp://www.gearlog.com/2008/11/hondas_robot_legs_draft.php
Other Tech: Robot suit will be used to climb mountainhttp://nextbigfuture.com/2006/04/other-tech-robot-suit-will-be-used-to.html
Not sure what this is but the photo looked interesting:BLEEX is a Development of Military Importance: A Cure for Spina Bifida? Mindfully.org Email Response 6may04http://www.mindfully.org/Technology/2004/BLEEX-Not-A-Cure6may04.htm
If you mean which therapeutic health equipment is in use for treating health conditions now, which could include spina bifida that may have a battery I looked at these pages that look like rules about what health equipment is used in some states:There seem to be a wide range of types of artificial stimulation of muscles, this list could have what you were looking for:Threshold Electrical Stimulation as a Treatment of Motor Disordershttp://blue.regence.com/trgmedpol/dme/dme57.html
If you are looking for equipment with a battery these sound likely as they would be more portable:Electrical Stimulation Devices for Home Usehttp://blue.regence.com/trgmedpol/dme/dme11.html
If you mean is there any research linking spina bifida specifically to health equipment that may use a battery here is one abstract from a spina bifida association website, you could ask them if they have any further info or try to track it through your nearest public or academic library or interlibrary loan dept if worthwhile:"Glinsky J, Harvey L, Van EP. Efficacy of electrical stimulation to increase muscle strength in people with neurological conditions: a systematic review. Physiother.Res.Int. 2007 Sep;12(3):175-94.Abstract: BACKGROUND AND PURPOSE: Weakness in partially paralysed muscles is a disabling impairment for people with neurological conditions. Strength training programmes are widely administered to address this impairment. There is a common belief that the effectiveness of strength training programmes can be enhanced by the addition of electrical stimulation. The purpose of this systematic review was to assess the efficacy of electrical stimulation for increasing voluntary strength in people with neurological conditions. METHOD: Eligible randomized trials of electrical stimulation were identified by searches of computerized databases. The search yielded 11,267 abstracts, of which 60 were retrieved. Two assessors independently reviewed full text versions of these articles. RESULTS: Eighteen studies satisfied the inclusion criteria. These studies involved participants with spina bifida (n = 1), cerebral palsy (n = 1), peripheral nerve lesion (n = 1), multiple sclerosis (n = 1), spinal cord injury (n = 3) and stroke (n = 11). The mean (SD) PEDro score for trial quality was 4.9 (1.0) out of 10. Meta-analyses of studies involving similar patients were not done because of insufficient data or lack of homogeneity. The results of all studies were analysed individually. CONCLUSION: Several studies suggest a modest beneficial effect of electrical stimulation in patients with stroke. It is not clear whether patients with other types of neurological disabilities benefit from electrical stimulation in the same way.[Strengthening has been shown to improve activities in people with a variety of neuromuscular conditions. This article reviews the use of electrical stimulation, which is used to enhance physical activity in people who have partially paralyzed muscles. Only one study involved people with spina bifida, but suggested that such stimulation may have a small beneficial effect on increasing strength. Further studies of this intervention should be conducted in people with spina bifida to see if the benefits outweigh the costs and risks.]"   http://www.spinabifidaassociation.org/site/c.liKWL7PLLrF/b.2643297/k.C04E/General.htm
If you mean do you have any information about how I can access health equipment here is an intro to physical therapy:Physical Therapy: http://kidshealth.org/parent/system/ill/phys_therapy.html
Other questions to note: is a physical therapist what is needed or is it some other specialty eg. sports therapist, physical rehabilitation program, medical rehabilitation specialist etc., does that person have experience/specialty in my health problem, do they offer the use of health equipment or not at the office, for rent, or recommended for purchase for use in the home, do you need a referral from a doctor or can you self-refer, do they require a health plan or can you pay yourself, what are the conditiions you have to meet to remain a patient at the clinic eg. number of mandatory visits before reassessment is made, is there a local university/research center/specialist/physical rehabilitiation center that specializes in spina befida problems that could offer specialized treatment/equipment etc. 
Specialized services in your area may offer a wide range of treatment options for spina bifida EG:you may want to serch for such places and find out conditions of participation/services EG.National Rehabilitation Hospital, Washington, D.C. http://www.nrhrehab.org/Patient+Care/Conditions/Condition_Page.aspx?id=20
For further research here is A free archive of life sciences journals on a government website:http://www.pubmedcentral.nih.gov/
For example using search words spina bifida gait I found this free article with research done in Sacramento:Effectiveness of an Upper Extremity Exercise Device Integrated With Computer Gaming for Aerobic Training in Adolescents With Spinal Cord Dysfunctionhttp://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1864855&tool=pmcentrez
For more videos from Honda go to http://www.youtube.com and search Honda legs
Source(s):
http://www.youtube.com
http://www.springerlink.com/content/cvln61483573q0j4/ http://www.ijtr.co.uk/cgi-bin/go.pl/library/article.cgi?uid=13621;article=I...
http://66.102.1.104/scholar?hl=en&lr=&q=cache:XTthZSi73NUJ:hum.i-te...
http://ezinearticles.com/?Comparison-of-Exoskeletons-and-Bionic-Legs&id...
http://www.robotliving.com/2008/11/11/hondas-robot-legs/ http://jalopnik.com/5079645/honda-unveils-experimental-robot-legs-human-cyb... http://www.gearlog.com/2008/11/hondas_robot_legs_draft.php http://nextbigfuture.com/2006/04/other-tech-robot-suit-will-be-used-to.html http://www.mindfully.org/Technology/2004/BLEEX-Not-A-Cure6may04.htm
http://blue.regence.com/trgmedpol/dme/dme57.html
http://blue.regence.com/trgmedpol/dme/dme11.html
http://www.spinabifidaassociation.org/site/c.liKWL7PLLrF/b.2643297/k.C04E/G...
http://kidshealth.org/parent/system/ill/phys_therapy.html
http://www.nrhrehab.org/Patient+Care/Conditions/Condition_Page.aspx?id=20
http://www.pubmedcentral.nih.gov/
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1864855&tool=...


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