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Sales Office:

Email: sales@topexbattery.com

Tel: +86-755-86716032

Fax: +86-755-26607726

Skype: sales@topexbattery.com

Add:13th Floor, Mingzhuo Building, Guangming, Longhua, Shenzhen, China, 518107 


Headquater:

Email: info@topexbattery.com

Tel: +86-188-242-TOPEX

Fax: +86-755-36675442

Add: No. 401 Technology Road, Qingxi Town, Dongguan, Guangdong, China, 523641


Service Hotline
+86-755-86716032

FAQ

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Comparison of Rechargeable Batteries

 

Parameters

Lead Acid

Ni-CD

Ni-MH

Liquid

Polymer

LiFePO4

Li-Ion

Li-ion

Voltage (V)

2

1.2

1.2

3.6

3.6

3.2

Weight energy density (Wh/Kg)

35

50

80

125

170

145

Volume energy Density (Wh/l)

80

150

200

320

400

250

Charge Time(hours)

5~8hours

2~5hours

2~5hours

1~3hours

1~3hours

1~3hours

Safety

Safe

Safe

Safe

Less Safe

Less Safe

Very Safe

Cycle life (times)

300

500

500

800

1000

3000

Cost per Cycle

$

$$

$$

$$

$$

$

Self discharge

(%/ month)

0

25~30

30~35

6~9

2~5

3

Electrolyte state

Liquid

Liquid

Liquid

Liquid

Polymer Gel

Liquid/Polymer Gel

Min. thickness

> 10 mm

>3mm

>3mm

>3mm

<1mm

>3mm

Memory effect

No

Yes

No

No

No

No

Pollution

Yes

Yes

No

No

No

No

Advantages

High drain current and low cost

Middle drain current and low cost, smaller volume

Middle drain current and cost, higher capacity

higher capacity and lighter weight

Highest capacity, lighter weight and flexible shape

Highest capacity, lighter weight, flexible shape and extremely long life

Disadvantages

Too heavy

Environmental not friendly

Higher self-discharge and weight

Low drain current and higher cost

High cost

Low temperature

Applications

Car and lighting

Power tool, cordless phone and emergency lighting etc.

Toy, PDA,MP3 and digital camera etc

Cellular phone and laptop computer

Laptop computers

Solar, lighting, EVs, power tools, consumer products, UPS back up

 

Technical Questions:

Q: What is the best battery?

A: Below is a summary of the strength and limitations of today's popular battery systems. Although energy density is paramount, other important attributes are service life, load characteristics, maintenance requirements, self-discharge costs and safety. Nickel-cadmium is the first rechargeable battery in small format and forms a standard against which other chemistry are commonly compared. The trend is towards lithium-based systems.


Nickel-cadmium- mature but has moderate energy density. Nickel-cadmium is used where long life, high discharge rate and extended temperature range is important. Main applications are two-way radios, biomedical equipment and power tools. Nickel-cadmium contains toxic metals.


Nickel-metal-hydride- has a higher energy density compared to nickel-cadmium at the expense of reduced cycle life. There are no toxic metals. Applications include mobile phones and laptop computers. NiMH is viewed as steppingstone to lithium-based systems.


Lead-acid- most economical for larger power applications where weight is of little concern. Lead-acid is the preferred choice for hospital equipment, wheelchairs, emergency lighting and UPS systems. Lead acid is inexpensive and rugged. It serves a unique niche that would be hard to replace with other systems.


Lithium-ion- fastest growing battery system; offers high-energy density and low weight. Protection circuit are needed to limit voltage and current for safety reasons. Applications include notebook computers and cell phones. High current versions are available for power tools and medical devices.


LiFePO4-very promising and blooming in the market. A very good replacement for lead acid, Ni-MH and Ni-CD batteries, due to excellent performance of safety, high energy density, long cycle life and lower cost; very good choice for applications like solar storage, lighting system, portable appliances and UPS back up etc.


Q: Is PCM or BMS necessary for lithium battery? If yes, why?

A: Yes, it is necessary for lithium battery. Since lithium battery is hazardous goods and may cause leakage or fire if misused. PCM and BMS is a necessary method to protect the battery from over-charge, over-discharge, over-current, over-temperature and short circuit. BMS also has functions of SOC(state of charge), SOH(state of health), communication and LCD screen etc.


Q: What are the possible reasons for zero voltage or low voltage of the battery pack?

A: Short circuit or open circuit of the connector or wrong connection, de-soldering or cold solder joint between the batteries and lead, wrong connection between the batteries. 


Q: What are the possible reasons if the rechargeable battery or rechargeable battery pack can not be charged?

A: The battery is zero voltage or there is battery with zero voltage in the battery pack. 

There is wrong connection inside the battery pack. 

There is abnormity of electronic components and/or PCB inside the battery pack. 

There is failure in charger. 

Outer element causes the charging efficiency to be too low, such as extremely low or high temperature.


Q: What will happen if the batteries with different capacity are packed together?

A: If the batteries with different capacity or new and old batteries are used together, leakage, zero voltage and so on might happen. If the batteries are rechargeable and are being charged, some batteries is overcharged and other batteries is not in full charged state. During the discharge, some batteries can not discharge fully and other batteries might over discharge. This way, the battery will be damaged.


Q: Can I use Lithium batteries mixing with other battery types?

A: If different types of batteries are used together, or new batteries are used with old ones, the difference in characteristics of voltage, capacity, etc , may cause over-discharge of the battery which is exhausted first, leading to swelling, bursting or fire.


Cautions and Warnings for Using Lithium Battery

* Don’t immerse the battery in water. 

* Don’t use and leave the battery near a heat source such as fire or heater.

* When charging, use a battery charger specifically for that purpose.

* Don’t reverse the positive and negative terminals.

* Don’t connect the battery to an electrical outlet directly.

* Don’t discard the battery in fire or heater.

* Don’t connect the positive and negative terminal directly with metal objects.

* Don’t transport and store the battery together with metal objects such as necklaces, hairpins.

* Don’t strike, throw or trample the battery.

* Don’t pierce the battery with a nail or other sharp object.

* Don’t leave, charge or use the battery at very high temperature conditions (for example, strong direct sunlight or a vehicle in extremely hot conditions).  

* If the battery leaks and the electrolyte get into your eyes, don’t wipe eyes, instead, thoroughly rinse the eyes with clean running water for at least 15 minutes, and immediately seek medical attention. Otherwise, eyes injury can result.

* If the battery gives off an odor, generates heat, becomes discolored or deformed, or in any way appear abnormal during usage, recharging or storage, immediately remove it from the device or battery charger and stop using it.

* In case the battery terminals get dirty, clean the terminals with a dry cloth before use.

* If the battery beyond the useful-life, please fully discharged, sticks the battery with insulating tape, then put the cell to the specialized recycle bin.

* Tape the discarded battery terminals to insulate them.

* Stop charging the battery if charging isn’t completed within the specified time.

* Stop using the battery if the battery becomes abnormally hot, order, discoloration, deformation, or abnormal conditions are detected during use, charge or storage.


Commercial Questions:

Q: What is your payment term?

A: T/T, L/C, Western Union and PayPal.


Q: What is your delivery term?

A: Generally FOB Shenzhen, but CNF, CIF, DDU are available.


Q: Can you ship the batteries to my side by air or by sea?

A: Yes, we have the required UN38.3 and MSDS for the batteries and package the batteries in the required way, so we can ship casually to you by express(FedEx, DHL, TNT or UPS), by air to your local airport or by sea.


Q: What is your lead time?

A: We have millions of cells in stock and thus can ensure very fast delivery time. Generally when all the accessories are ready, sample production will take 3~5working days for production and test. International air shipping will take about 3~7working days. For volume production, we guarantee a 15~25working days from the day of receiving your PO.


Q: Why we buy from you?

A: 1. Feedback within 24hours, provide solution within 48hours.

  2. Over 10years production and design experience on lithium battery will provide you the best solution with innovation.

  3. We insist on offering you military standard quality, consumer standard appearance and industrial standard cost.

  4. We do everything for you, except placing your orders.