Lithium ion batteries are a great thing to buy if you want to cut your battery costs. They are not a new invention, they were first made in 1912. there are a huge amount to different batteries available from the smallest ones to some really big industrial type. For the amount of power that they are able to store. Most other types of power storage units are much bigger than Lithium ion batteries. The other main batteries that could be used for the same thing are much heavier. Lithium ion batteries high capacity is due to the material that they are made of. Lithium ion batteries do not suffer from a high discharge rate and are very practical for storing energy efficiently as well.
Speed - you can have variable speed option in these cordless drills. You need to buy a drill which will provide you with the appropriate amount of speed that you want. Depending upon the speed you will be able to screw on things a lot quicker or even slower. So keep the speed in mind while buying it.
This can be a problem for where the battery is not used that often but is can be important when it is needed for emergencies such as power outages. As the battery does not store well over extended amounts of time, it is possible that when they are needed they will not be usable. But for things that are used and recharged on a regular basis such as for portable electrical equipment, they are very good. But there is not always a slowing amount of capacity when they are getting old and it is possible for them to just not li ion stock work without any reason being obvious.
When it's time to buy a new lithium ion battery, be sure you're buying one that's new (as in recently produced). Just like fruit has a shelf-life, so do batteries and just like you want to buy fresh produce, you also want to invest in "fresh" lithium ion cells. Check the date-code on the battery or packaging to ensure you're not buying a pack that's been degrading for a year on some shelf.
The weakest aspect of any smart phone would be battery life. You need to know the extent of your Lithium battery stocks Ion or suffer the consequences at the end of the sale. Most manufacturers offer some guidance on this department but only to the point they are most comfortable to share. What they wouldn't share to you is that you should never recharge your phone. You pick up the phone; saw that it is just around 30%. That is OK, leave it as it is. You juice it up fast, the device will not recharge as efficiently once you do it again. You need to drain the battery first from the stock power and then do the recharge.
If your cordless tools were acquired a long time ago, the battery and charger were of an older technology. The new generation batteries are more efficient and can be charged very quickly. That can be a slight problem with the older charger. The newer chargers have a smart sensing circuit that will cut down Lithium mines Ontario the charge rate as the battery is close to getting full. But for older chargers that do not have such smart circuits, they can overcharge the battery, making it hot when it's left on the charger for extended amount of time. So it's worth the time to investigate if a newer type of charger should be in order when getting a new replacement battery.
Most automakers would like to see Lithium-Ion battery packs (you probably have a Li-Ion battery in your cell phone) which can store more energy. But as of right now, they are still too volatile/unreliable when placed in large packs for major carmakers to use. But that should be changing in the next few years. Both GM (with their Plug-In Saturn Vue) and Toyota (next generation Prius/ Hybrid Systems) believe the next generation of hybrids will come with Li-Ion battery packs.
With government incentives, the cost of one of these EV's can be reduced to a more acceptable range, keeping the cost closer to a conventional gas vehicle. There are also reduce maintenance costs with an EV, no oil changes and the electric motors are mostly maintenance free.