FAQ

1. What is the difference between Lithium batteries and Lithium Ion batteries? 
There are several important differences. The practical difference between Lithium batteries and Lithium-ion(Li-ion) batteries is that most Lithium batteriesare not rechargeable but Li-ion batteries are rechargeable. From a chemical standpoint Lithium batteries use lithium in its pure metallic form. Liion batteries use lithium  compounds which are much more stable than the elemental lithium used in lithium batteries. A lithium battery  should never berecharged while lithium-ion batteries are designed to be recharged hundreds of times.


2. What are the advantages of Lithium Ion batteries compared to other rechargeable batteries? 
Lithium-ion batteries have several advantages: 
They have a higher energy density than most other types of rechargeable. This means that for their size or weight they can store more energy than otherrechargeable batteries. They also operate at higher voltages than other rechargeable, typically about 3.7 volts for lithium-ion vs. 1.2 volts for NiMH orNiCd. This means a single cell can often be used rather than multiple NiMH or NiCd cells. Lithium-ion batteries also have a lower self discharge rate than other types of rechargeable batteries. This means that once they are charged they will retain their charge for a longer time than other types of rechargeablebatteries. NiMH and NiCd batteries can lose anywhere from 1-5% of their charge per day, (depending on the storage temperature) even if theyare not installed in a device. Lithium-ion batteries will retain most of their charge even after months of storage. So in summary; lithium-ion batteries can be smaller or lighter, have a higher voltage and hold a charge much longer than other types of batteries.

Items

Li-ion           

Ni-MH       

Lead-acid 

Cycle life (cycles)

500      

400       

300

Energy efficiency (C discharge/C charge)

99%

70%

75%

Weight comparison for the same capacity

1

2

4

Size comparison for the same capacity

1

1.8

3.5

Reliability

High

Low

 High

 

3. What are the disadvantages of Lithium Ion batteries compared with other rechargeable batteries? 
Lithium-ion batteries are more expensive than similar capacity NiMH or NiCd batteries. This is because they are much more complex to manufacture. Li-ionbatteries actually include special circuitry to protect the battery from damage due to overcharging or undercharging. They are also more expensivebecause they are manufactured in much smaller numbers than NiMH or NiCd batteries. Li-ion batteries are becoming less expensive and overtime we should see their price decrease significantly. Lithium ion batteries are not available in standard cells sizes (AA, C and D) like NiMH and NiCd batteries. Lithium-ion batteries also require sophisticated chargers that can carefully monitor the charge process. And because of their different shapes andsizes each type of Li-ion battery requires a charger designed to accommodate its particular size. This means lithium ion battery chargers are moreexpensive and more difficult to find than NiMH and NiCd battery chargers.

4. What is the best way to store Lithium Ion batteries? 
Lithium-ion batteries can hold a charge for many months. It is best to store a lithium-ion battery with a partial or full charge. Occasionally, a lithium-ionbattery with a very low charge is stored for a long period of time (many months) and its voltage slowly drops to below the level at which its built in safety mechanismallows it to be charged again. If the battery is going to be stored for several months it’s a good idea to take it out and recharge it after a fewmonths. Better yet would be to actually use the battery every few months and then leave it partially or fully charged。

5. How should I dispose of Lithium Ion batteries? 
Lithium ion batteries, like all rechargeable batteries are recyclable and should be recycled. They should never be incinerated since they might explode. Most places that sell rechargeable batteries will also accept them back for recycling.

 

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