================== W A R N I N G ! ! ====================
Li-Ion batteries are very dangerous if not handled properly.
Use them only with proper protection circuits and chargers.
Using any of the informations available on esp8266-projects.com
 is on your own risk !!

Finally Arrived! This was a long awaited one. Postal service at it’s best 🙂

I was asked for a more compact and easy to recharge battery pack solution for the ESP8266 Modules and with the new items arrived in the MailBox, here it is:

                                          ESP8266 Battery Module

What we will need:

  • LGDB318650 – Rechargeable 3,7V/2600mAh Li-ion Cell
  • 18650 Cell holder
  • Li-ion Charger/Monitor with protection
  • Asorted wires – choose your desired color but red/black, blue/white standard coding with be better 🙂

                                            Li-ion Cell and holder

   As the LGDS318650 Li-ion Cells does not have any internal protection been bare ones – usual find in laptops battery packs – we will need to use a charger/monitor with some sort of protection mechanism.

Forget the Ni-Mh abuse if you want to run your Li-ion cells properly and safely for a long lifespan.  Li-ion Cells shouldn’t be charged/discharged/drained more than the recommended values to prolong its life and even to avoid a nasty explosion or fire!

The module from the picture below it’s covering decently all the required needs:

  • USB compatible constant-current/constant-voltage charger – linear
  • Monitor for overcharge/overdischarge and/or overcurrent
  • High speed MOSFET Switching protection mechanism

                        Li-ion Cell Charger/Monitor with protection

It is based on TP4056 1A Standalone Linear Li-lon Battery Charger with Thermal Regulation chip

The TP4056 is a complete constant-current/constant-voltage linear charger for single cell
lithium-ion batteries. Its SOP package and low external component count make the TP4056
ideally suited for portable applications. Furthermore, the TP4056 can work within USB and wall

No blocking diode is required due to the internal PMOSFET architecture and have prevent to
negative Charge Current Circuit. Thermal feedback regulates the charge current to limit the die
temperature during high power operation or high ambient temperature. The charge voltage is
fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The
TP4056 automatically terminates the charge cycle when the charge current drops to 1/10th the
programmed value after the final float voltage is reached.

TP4056 Other features include current monitor, under voltage lockout, automatic recharge and
two status pin to indicate charge termination and the presence of an input voltage.

                                         TP4056 – SO8 package


  •  Programmable Charge Current Up to  1000mA
  • No MOSFET, Sense Resistor or Blocking  Diode Required
  • Complete Linear Charger in SOP-8 Package for Single Cell Lithium-Ion Batteries
  • Constant-Current/Constant-Voltage
  • Charges Single Cell Li-Ion Batteries Directly from USB Port
  • Preset 4.2V Charge Voltage with 1.5% Accuracy
  • Automatic Recharge
  • Two Charge Status Output Pins
  • C/10 Charge Termination
  • 2.9V Trickle Charge Threshold (TP4056)
  • Soft-Start Limits Inrush Current

   For more details please see TP4056 Datasheet

TP4056 is accompanied with DW01-G battery protection IC.

DW01-G is designed to protect lithium-ion/polymer battery from damage or degrading the lifetime due to overcharge,overdischarge, and/or overcurrent for one-cell lithium-ion/polymer battery powered systems, such as cellular phones.

                      Protection circuit – DW01-G + Mosfet switch

   DW01-G has an accuracy of ±50mV overcharging detection voltage that ensures safe and full utilization charging. Also the very low standby current drains little current from the cell while in storage.


  • Reduction in Board Size due to Miniature SOT-23-6 Package
  • Ultra-Low Quiescent Current at 3μA (Vcc=3.9V)
  • Ultra-Low Power-Down Current at 0.1μA (Vcc=2.0V)
  • Precision Overcharge Protection Voltage 4.25V ± 50mV
  • Load Detection Function during Overcharge Mode
  • Two Detection Levels for Overcurrent Protection
  • Delay times are generated by internal circuits. No external capacitors required

  Battery Protection Swithing is done with 8205A Mosfet. The ML8205A uses advanced trench technology to provide excellent RDS(ON), low gate charge and operation with gate voltages as low as 2.5V. This device is suitable for use as a Battery protection or in other Switching application.

We will use this battery solution setup in the future for our battery powered projects.

Stay tuned for more about soon!

Leave a Reply

Your email address will not be published. Required fields are marked *

Related Posts


Mailbag – Nextion Enhanced NX8048K070_011C – teardown

For any of you looking for affordable HMI Displays, it is Special Summer sale on Bangood until 20 Aug 2017!! https://www.banggood.com/search/nextion.html?p=A524021677049201505T ———————————————————————————————————————————————————————- Part 2 of the Nextion HMI  Enhanced NX8048K070_011C Display Series, teardown time! And a Read more…


Mailbag – Nextion HMI Display – Enhanced NX8048K070_011C

And the story behind: Today we will start a new hands-on tutorial series generally related with Display options available for the esp8266 projects and in particular with the smarter type of Displays, the HMI (Human Read more…

battery monitor system

Thingspeak – SmartMon Ext Board P4

This is Part 4 of the SmartMon Extension Board series. SmartMon v2.7ex Board  is a extension board fully compatible with Arduino, ESP8266, ARM, PIC & other available MCu’s out there.  As long as your MCU/Dev Read more…