Description:

Product Overview:

The DNK402550 is a high-performance 3.7V 500mAh lithium polymer (LiPo) battery pack designed for compact electronic devices that require lightweight, reliable, and rechargeable power solutions. Measuring just 52mm x 25mm x 4mm and weighing only 9.8 grams, this ultra-slim battery is ideal for space-constrained applications without compromising performance.

Equipped with a customizable connector and BMS (Battery Management System), the DNK402550 supports charging up to 4.2V ≤2A and discharging up to 3.7V ≤3A, with both values adjustable according to your needs.

Features:

• Ultra-compact design (52254 mm) for space-limited devices
• Rechargeable 3.7V 500mAh capacity for extended usage
• Lightweight at just 9.8g – perfect for portable applications
• Customizable charge/discharge current and connector options
• Reliable LiPo chemistry with over 500 cycles (at 80% capacity)
• Custom BMS integration for added safety and functionality

Applications:

• Wearable electronics (fitness trackers, smartwatches)
• Portable medical devices
• Wireless sensors and IoT devices
• Mini drones and RC models
• Bluetooth accessories and audio devices
• Handheld electronics and tools

1.Don’t disassemble or modify the battery

DNK battery pack is packaged by Aluminum laminated plastic film which is easy to be damaged by sharp edge such as pin, needle, edge of devices like nickel tabs, etc. If they have serious damage, electrolyte leakage, short-circuit between positive and negative tabs, etc. It would cause the generation, smoke, rupture, or flaming with mishandling.

2.Don’t incinerate or heat the battery pack

Don’t use or leave battery nearby fire, stove or heated place (more than 130℃). These occur the melting of insulator, damage of safety function, or ignition on electrolyte. In case that separator made of polymer is melted by high temperature, the internal short-circuit occurs in individual cells and then it would cause the generating, smoke, rupture or flaming.

3.Don’t use any damage battery pack

Don’t use the battery that are dented or bent on their edge part. DNK batteries are possible to be damaged by strong mechanical shock and it would cause wire break, short-circuit inside the cell, leakage of electrolyte, etc.

4.Don’t drive a nail into a battery pack, strike it by hammer, or tread it.

As the battery might be broken or deformed and then it will be short-circuited, it would cause the generating, smoke, rupture or flaming.

5.Don’t give battery pack impact or fling it

If the battery is broken, the battery will be charged at abnormal voltage or current and abnormal chemical reaction will occur. It may cause the generating, smoke, rupture or flaming.

6.Don’t make the direct ultrasonic wave power to the battery or soldering near the battery

It may cause serious damage to the batteries. Soldering near the battery may cause damage of the components, such as separator and insulator, are melted by heat, it would cause the gas generating, smoke, rupture or flaming.

7.Don’t use battery nearby the high temperature place or under the blazing sun.

DNK batteries have possibility to be degraded its performance such as capacity, thickness increase, impendence, etc. The battery will be charged at the abnormal chemical reaction occurs in the high temperature place. The thickness change may lead to stressing on battery case/ device, wiring or cell which may have possibility to lead to damage performance.

8.Don’t use the unspecified charger.

If the battery is charged with unspecified condition, there are causes that it will be overcharged or the abnormal chemical reaction will occur in cells. It causes the gas generating, smoke, rupture or flaming.

9.Don’t reverse polarity (and terminals)

On charging, the battery is reversed-charged and abnormal chemical reaction occurs. There may be case that unexpected large current flows on discharging. There causes the generating, smoke, rupture or flaming.

10.Don’t reverse-charge or reverse-connect

The battery has polarity. In case the battery is not connected with charger or equipment smoothly do not force them to connect and do check polarity of battery. If the battery is connected to opposite polarity with charger. It will be reverse-charged and abnormal chemical reaction will occur. It would cause the generating, swelling, smoke, rupture or flaming.

11.Don’t connect battery to the plug socket or car-cigarette-plug

Added high voltage to the battery, the excessive current will flow in it and then it may cause the generating, swelling, smoke, rupture or flaming.

12.Don’t use battery for another equipment

If the battery is used for unspecified equipment, it will deteriorate its performance and cycle-life.

13.Don’t touch a leaked battery directly

In case the leaked electrolyte gets into eyes, wash them with fresh water as soon as possible without rubbingeyes. And then, see a doctor immediately. If leave damaged eyes undone, it will cause eye-trouble.

14.Keep the battery away from babies

Keep the little battery out of the reach of babies in order to avoid troubles by swallowing. In case of swallowing the battery, see a doctor immediately.

15.Don’t get into a microwave or a high pressure container

Because of sudden heat or damage of sealing condition of battery, it may cause the generating, smoke, rupture or flaming.

16.Don’t use a leaked battery nearby fire

If the liquid leaks from the battery (or the battery gives out bad smell), let the battery leave from flammable objects immediately. Unless do that, the electrolyte leaked from battery may catch fire and it would cause the smoke, flaming or rupture of it.

17.Don’t use an abnormal battery, such as leakage, swelling, deformation, etc.

In case the battery has bad smell, it generates, its color change or it is warped in using (includes charging and storage), let it take out from equipment or charger and do not use it. If an abnormal battery is used, it may generate bad performance or damage the device or pack.

1 I want to custom lipo battery cell, can you make it?
We are Lithium Polymer Battery Cell Manufacturer for 7 years, so if you have any request on Lipo battery cell or lipo battery pack, simply Drop us an inquiry.

2 How Soon can I get samples, and how much will you charge it, will you refund?
We make samples in about 3-12 days, depending if we have them in stock, no extra markup on samples, and will refund on mass production.

3 What’s your warranty? When does it start?
All of our products have a one-year limited warranty, start from the shipping date.

4 Does all the cell listed here have stock?
We will check our stock status for you, simply drop an email.

5 Tell me about your LG, Samsung, Sony Cells, quite interested in them, are they brand new or recycled cells?
Being in lipo battery industry for so many years, we have rich channels for those Korea or Japanese cells, all of them are brand new, just ask for stock status.

6 How about your lead time, and especially when can I get the bulk order after I send payment?
Lead Time for samples is about 3-10 days and bulk order around 12-25 days depending on the order quantity and our order on schedule.

7 How about the MOQ?
Mostly we don’t have MOQ. Especially for the samples. For any Custom battery, our MOQ 100.