The basic rule of getting a replacement battery is that it should have the same voltage as the original. An 18V drill cannot run on a 12V battery. It can only run on a 18V battery. The other thing is that the physical packaging of a battery can be different from company to company. A 12V Ryobi battery may not fit into a 12V Makita cordless drill unless the battery has the right physical dimensions. So make sure the replacement battery looks the same as the old one before you order it. Also, if you are looking for a replacement battery of the same voltage rating and by the same company, know that battery technology is changing rapidly. An 18V lithium-ion battery has a different physical packaging than a NiCad 18V battery.
Battery Power: Take a look at the kind of batteries the GPS uses and how long the batteries will last. If the display is backlit, then the unit might use up batteries quicker if you're backpacking at night. Lastly, lithium batteries will keep working longer than rechargeable. lithium batteries also function well in a cold climate. Certain particular units possess a sleep mode which will conserve battery life.
GPS stands for Global Positioning System. That is a fancy term that tells you exactly where you happen to be. Sort of like those fantastic maps cobalt mining copyright within the malls which have a dot that states You Are Here". It does this by talking with government satellites. You will find over 24 of them, but the GPS only requires 3 to be able to discover your place. It does this by triangulation (Am I becoming way too technical?) Today's GPS, if Wide Area Augmentation System (WAAS) capable, can calculate your place to within 3 meters (about 10 feet), but do not depend on that sort of accuracy. The GPS ought to be in a position to establish your place to 30 feet or even less.
Cordless Drills have different power ratings. The least powerful ones are very compact in size. The next size up have more power and are used for general projects. Then there's the super powerful ones that's big and specialized. The different power ratings of the tool are meant to do different type of projects. If you use a highly powerful one to do a dandy job of fastening tiny little screws of a delicate jewelry box, then clearly the tool isn't the best one.
A lithium drill is much lighter than a comparable drill of the same voltage. This allows you to use higher voltage tools with lighter weight. Remember, voltage equals power, mah equals the gas tank of the battery. So, if you are using a 12 volt now, a 18 volt or even a 36 volt lithium mines ontario drill will offer you much more power and still have the same run time of you 12 volt with close to the same weight.
The BIGGEST negative with all of their models is that they have just a 12 month warranty... not NEARLY as good as other popular brands which have 10 years 5-10 years. This shows a lack of confidence in their product.
6) Do not purchase spare battery for storage - It is not a good practice to buy spare battery for storage purposes. Observe the manufacturing date carefully. Storing up old stock even at a discounted price is not a good idea.