Best Christmas Gift Power Bank ,Power Bank 4000mah For Mobile Phones  

bank :
1) please charge the gift power bank once 3 months if the bank not used for a long time
2) It's normal that the temperature is a bit high during charging
3) please keep th bank clean and dry,do not wash the bank with chemistry depurative
4) please protect the environment ,do not abandon .

Our power bank PCB

(1) Overcharge protections (2)Over discharge protections 

(3)short-ciruit protections(4) stable voltage protections. 

(5) Automatically identify the phone current protections.

Smart IC Solution for this power bank :

It’s an controlled and protected by IC,Much more reliable than the low cost items.

Smart IC Function

Over load protection  Over voltage protection  Short-circuit protection

Power Conversion Rate:

Technically, battery capacity of power bank does not equal to chargeable capacity to other devices. Take a 6000mah power bank for example. The capacity of power bank refers to the lithium battery inside it. When the power transfers from power bank to the mobile, it is not a 100% conversion rate due to the following reasons:

1)    Voltage transform from 3.7V to 5V: power bank lithium battery is 3.7V around, while it charges for mobile phone, 5V voltage is required. According to energy conservation principle, the battery reaches mobile phone should be 6000mah*3.7V/5.0V=4440mah.

 2)    Other factors that cause further power consumption: internal resistance of power bank &mobile phone, heating from power bank & mobile phone, etc. All these will take away some percentage of energy. For a good quality grade A power bank, the extra consumption will be about 15%. So the final power reaches mobile is around 3774mah. The formula is 6000mah*3.7V/5V *(100%-15%)=3774mah.

 Then how many times it can charge the mobile phones? See below illustration.

 Production Flow:

1)   SMT machine producing the PCBA Board, which is the core of a power bank

2)   Battery Test: to test the Voltage & Resistance to ensure they are in a safe range.

3)   Spot Welding: to weld the battery to two cables (stands for the positive&negative end).

4)   Aging test of semi-finished product:full charge, full discharge, and charge the battery again to a certain percentage of power, like 50-70%. Could not be too full.

5)   Final assembly/polishing/packing:

6)   Packed ready for delivery

All our raw materials/semi finished product/finished product are under strict check and test to ensure 100% good rate before delivery.

Packaging & Shipping

Packing Information

TXW901 (15PCS Power Bank +15PCS Acrylic)/CTN

Carton size:30.5*28.5*20.5CM G.W.:10.5KGS/CTN

Shipment Terms

1. All items will be shipped out within 1 - 3 working days after confirm the payment

2. DHL / FEDEX / UPS / EMS / TNT / China Post

Payment Terms

We accept T/T, PayPal, Western Union, MoneyGram and others

Best After-Sales Service

Warranty: 12 months

Logo printing,OEM,ODM services available

Factory defective rate: around 0.3%

Made by pure material/copper

Company Information

Established in 2005,Shenzhen Tianxiaowei Electronic Co., Ltd is a professional manufacturers

with more than 8 years

Power Bank,Travel Charger/Adapter, Car Charger/Adapter, Power Adapter and GPS Accessories.

Now there are more than 17 series of charger all comply with international quality standards.

High quality is our obligation. we have exported our electronic products to many countries and regions allover the world.Especially the USA, Europe and Asia. Our products enjoy a good reputation among our customers.

Main Products

Power Bank, Travel Charger/Adapter, USB Home/Wall Charger/Adapter, Power Adapter,

USB Car Charger/Adapter and GPS Accessories For Mobile Phone/ASUS&Acer&Amazon Kindle Tablets/GPS/PDA/Game Player/DVD,GPS Mount,Car Holder,Friction Mount ,

Beanbag Dashboard Mount Etc.

FAQ

Q1: What’s the difference between an adapter and a charger

A1: Basically, chargers and adapters do very similar things, but there is a difference. For example, laptops require chargers, as they usually require more power than USB adapters can provide.

Q2:What if I have a technical issue

A2: Any issues can be handled by contacting our customer support via the email provided or in our contact box on this page.

Q3: What warranty comes with the unit?

A3: All products come with a 12 months replacement warranty. In the unlikely event your unit fails within the first 12 months, return to us and we will replace providing authorized returns policies are met.

Q4: Can I print my brand logo on the chargers?

A4: Sure, OEM is available. Lazer printing and silk printing can be offered

Q5:What's your minimum order quantity?

A5: Our MOQ is 100 pcs per model. Welcome to test sample first.