Optional packages:cardboard box;transparent pvc box;case or customzied package

Optional usb charging cable:single usb charging cable;3 in 1 cable or 4 in 1 cable

English manual or other language manual

Shipping ways:

For sample or small order,we usually ship them by Express like UPS,Fedex,TNT,DHL,and it usually take 3-5 days 

For big order quantity,we usually ship them by air(5-7 days) or by sea(30-45 days)

1. We can provide OEM and ODM service

2. We can gurantee 12 months warranty

3. If there are some quality problem,we can replace new one for you and we will also pay the shipping cost 

4. we Gurantee all of our power bank with Grade A 18650 lithium ion battery cell or lithium polymer battery cell and real capacity 

5. Our professional salesperson will reply you and help you to solve problem soon

6. We can gurantee the high quality of products,one by one test before shipment

7. We can gurantee on time shipment

8. Any questions on technical issues,welcome to contact us.We will offer our help at the first time

Shenzhen DeLong Energy Technology Co., Ltd.(Dlongbattery) is a professional new energy supplier in China focusing on the manufacture, research and sale of lithium ion battery product worldwide ,it was established in 2006 and becoming the leading player in the new energy field through several years development .Delong company integrates the cell manufacturing and offer of power solution in according to different application purpose ,our product are widely applied on:common digital devices battery , high discharge rate battery,powerful electric vehicles battery ,low and High temperature lithium ion battery ,power storage and back-up battery pack etc.  

Q1: How long do I need to charge the battery at the first time?

A1: Please fully charge the battery at the first time, and it takes about 2.5-8 hours (depends on the capacity of the battery or how much power it left).

Q2: How long is the life of the mobile charger?

A2: Generally speaking, larger than 500 times. After that, the capacity will get smaller gradually.

Q3:What kind payment methods can you accept?

A3:We can accept T/T,Western Union,Paypal,Credit Card,E-checking.(welcome to place Trade Assurance order)

 Q4: Which model can be used to charge two devices at the same time?

A4: have 2 usb output model ..

Q5: How should I store and maintain the charger?

A5: Please store the charger in dry environment and at room temperature, and also keep it with 50% power remaining. It is highly recommended to fully charge the battery once every month to maintain the battery life even if you do not use it.

Q6: I have switched off my mobile phone or have charged it with a high capacity battery alreday, but my phone still cannot be fully charged. Why?

A6: For example, smartphone charging input voltage is 5V and Lithium battery voltage is 3.7V. When using a power bank with Lithium battery to charge a mobile phone, the power energy actually passed through two conversions. So the actual energy efficiency is about 80%.

Q7: What safety protections does the mobile charger have? 

A7: Short circuit protection, over-load protection, over-discharge protection,over-charge,over-current.