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Project Notes

#502 LiitoKala Lii-202 Smart Charger

Quick teardown and review of the Lii-202 18650 charger and power bank.



I wanted a general purpose 18650 charger and picked up the LiitoKala lii-202. It seemed like a good deal because it included 2x ICR18650 2600mAh batteries, and it included a power bank function in addition to supporting a multiple charging modes for a range of Lithium and Nickel Metal Hydride batteries.

I’ve since found a very good review with detailed performance tests. Overall it is a good unit, although the power bank function is a bit of a gimmick (only runs from one battery, and the output is a bit noisy).


Charger Specifications

Item Specification
Input Micro USB DC 5V, 1A/2A
Standy current ≤ 15mAH
USB Output no-Load 4.90V-5.30V
Weight 200g / 7.05oz
Dimensions (LWH) 1808053mm

Compatible batteries:

  • Li-ion 3.7V / Li-ion 3.8V / Li-Fe 3.2V / Ni-MH/Cd 1.2V
  • 26650, 22650, 18650, 18490, 18350, 17670, 17500, 17355, 16340, 14500, 10440, AAA, AA, SC, Setc
  • charges 2 batteries independently

Charging features:

  • Charge Current: 500mA/1000mA
  • Output Voltage:
    • Ni-MH/Cd 1.2V: 1.42-1.55V
    • Li-Fe 3.2V: 3.65+0.05V
    • Li-ion 3.7V: 4.2V+0.05V
    • Li-ion 3.8V: 4.35+0.05V
  • Quick Charge: Yes; Output Protection Voltage: 3.0+0.1V
  • Intelligent Charge: Battery anti-reverse, short circuit protection and overcharge protection

Battery Specifications

Item Specification
Brand Name LiitoKala
Model ICR18650-26FM
Type Li-Ion 18650
Nominal Capacity 2600mAh (2500-2600mAh)
Nominal Voltage 3.7V
Weight 45g±1g
Rechargeable Up to 500 times
Internal resistance ≤50mΩ
Limited Charge Voltage 4.2v
Working Voltage 2.75-4.2V
Size 65.5mm x 18.5mm (Diameter)



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Credits and References

About LEAP#502 PowerBMS
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.