Q: Both NiMh and NiCd batteries can be recharged over time, but you might want to think about investing in NiMh batteries over NiCd. NiMh batteries use newer technology to store more charge and can also be fast, slow, or trickle charged. Check the product in which you plan on using your batteries before purchasing your batteries. Certain equipment may require either NiMh or NiCd to operate best. These are one of the least expensive varieties of battery chargers available on the consumer market. A pre-set shutoff timer will charge all batteries in the charger for a period of time and shut off once that time has elapsed. These chargers are less precise than smart chargers, which can lead to under- and over-charging. Take this into account when buying a timer charger; over-charged batteries can be ruined and cost you more money. Smart chargers can be more expensive initially, but these are equipped with sensors that detect missing voltage in your batteries. This way, your charger will continue to charge your battery until it has reached full charge, saving you the cost of batteries ruined from over-charging. The rechargeable batteries you bought earlier will also help you to decide which charger you invest in. Some chargers are intended for only NiMh or NiCd batteries, though some universal chargers are available. Most AA and AAA battery chargers can be used for both NiMh and NiCd batteries, though you should always consult your manual to be certain. You should never attempt to charge a battery that isn't intended to be rechargeable. This can cause a dangerous explosion from hydrogen gas buildup and may ruin your battery or charger as well. Check the manual that came with your charger to know the recommended safety procedure for your charger, but generally you should:  Keep your charger and batteries away from fire or intense heat. Do not charge your batteries around or on top of flammable materials, including flammable gases, like gasoline vapor. Insert your batteries into your charger firmly before plugging in your charger. Prevent your charger from being exposed to rain, snow, water, and oil. These kind of batteries experience what is called the "memory effect." This means that if you charge your battery before it is completely dead, your battery will remember the smaller capacity as its full potential, which will hurt your battery life. Some batteries may have a specific amperage for best results. This may include charge times for "fast" or "standard" charge speeds. Always follow manufacturer recommendations for best results and safest use. As an example, you may see that your battery might have "Std. CHARGE: 60mA 14 - 16 hrs" written on it. This battery would charge best at 60 milliamps for a minimum of 14 hours. Some chargers come with an interface or a timer that you might need to set. You may be able to set the rate of charge (fast, quick, normal, slow, trickle) as a function of capacity. This is represented by a fraction of the capacity, represented by the format "C/#".  You should also set your timer with respect to your charge rate (C-rate).  For example, charging your battery at C/10 will charge 10% of your batteries full capacity per hour, charging your battery fully in a little over 10 hours, depending on efficiency of your charger. Many manufacturers recommend slower rates of charging. Faster charging will result in less efficient charging. This should be done before you plug your charger into an electrical outlet, unless otherwise indicated by your charger manual. Once you feel the batteries click into place, you can plug in your charger and begin charging. Once your timer is up or the display on your charger indicates that all batteries are fully charged, as is usually the case with smart chargers, unplug your charger and remove the batteries. If you find that your batteries are difficult to remove, use a gentle tapping motion until one is jarred free.
A: Learn the differences in battery chemistry to prolong battery life. Evaluate time controlled chargers. Optimize with smart chargers. Purchase an appropriate charger. Follow safe usage guidelines. Wait until the battery is completely drained for NiCds. Check for noted charge rates. Set your charger, if necessary. Insert your batteries. Remove all charged cells.

Q: The Internet has many commercial sites that provide VHRs. The free information, however, is limited. For example, CarFax advertises a free “myCarFax.com” report, which provides your car's service history, upcoming service alerts, and information about recalls. Other sites with free reports provide similar information that is based generically on your car's make and model, but is not specific to the car's VIN. Free reports typically provide the following generic information:  manufacturer model manufacturing details, such as chassis type, engine size, country of assembly, and engine power a general summary of what the full report would contain if you choose to purchase it. The five most commonly used sources for purchasing a VHR are CarFax, AutoCheck, the National Insurance Crime Bureau (NICB), and the National Motor Vehicle Title Information System (NMVTIS), which has two different sources. A full VHR, which you can usually purchase for a fee that ranges between $10 and $40, includes the following information about the specific car, based on its VIN:  ownership history clean title/ownership verification periodic odometer readings maintenance records history of rental or lease accident repair history flood repair history Until recently, full VHRs have only been available for purchase. As of December 2015, however, a source called Vehicle History (web address www.VehicleHistory.com) is offering a full VHR for free. The report from Vehicle History contains the following information:  vehicle ownership records vehicle information government records public records background history historical records state records If you are considering the purchase of a used car, the information that is available in a full report is generally worth the cost of the purchase. Purchasing a full VHR is usually less than $50, which is very small compared to the price of the car itself. As Consumer Reports points out, even if a mechanic tells you that the car is in good condition, the history of an accident, flood damage, or some similar incident in the car's history can greatly reduce its value. VehicleHistory.com appears to offer a full report for free. However, this is a relatively new resource, and less has been written about the validity of VehicleHistory.com than the other sources. Consumer Reports recommends that buyers consider comparing reports from multiple sources.
A:
Know the limitations of the information you can get for free. Understand the contents of a full report. Investigate a free report from VehicleHistory.com. Decide if you need to purchase a full report.