Think about it. The times have never been better for battery reconditioning and they will only improve. All that is required is about $150 worth of kit and a recondition a battery guide (around $50). We now all have so many portable devices requiring rechargeable battery power. NiCd, NiMh and lithium-ion batteries power iPods, Blackberries, palms, laptops, power tools, cell phones, and the list goes on and continues to increase year on year.
Automotive (lead acid) batteries start mowers, boats, cars, trucks, fork lifts and such like. This area should see an explosion as the auto makers further develop electric power vehicles. The 2009 Detroit Motor Show had numerous electric cars on display, albeit most of them from Chinese manufacturers. Battery status is easily checked using an analyzer operated via a laptop or computer. It comes with its own software and most are simple to manipulate. They give totally precise amperage, voltage and ohm readings which are critical for good overhaul.
A smart charger is worth the extra investment. It will never damage a battery being recharged. It will cut to a trickle charge as soon as the cell reaches capacity. Lithium based batteries can cause recycling problems but any other battery so far devised lends itself well to rejuvenation. Once the potential resuscitation of the cell has been established using the analyzer, there is little to do once you have the technical expertise. Whether simply to save money or to run a business, battery reconditioning is a cash wizard. My brother and I have saved literally thousands on our vehicles and numerous gadgets. Do check review about ez battery recondition on my another website.