MCP73831 - Li-Pol/Li-Ion single cell 1S 3.7V USB charger - Adafruit 1304

Solar power manager (B), Built-in 10000mAh rechargeable Li-Po battery, Multiple protection circuits. Compatible with 6V~24V solar panels, Rechargeable from solar panel or C-type power adapter. 5V/3A regulated output.

Charger 2x18650 with EU Plug Cable features:
- This product is very convenient and easy to use
- Black
- Material: metal and plastic
- Weight: 74g
- Input voltage: AC 100 -240 V 50/60 Hz
- Compatible with: 18650 Li-ion
- When the 18650 battery is connected to the charger, the red LED light will be displayed, and means green in full charge status
- Output: DC 4.2 V, 1A
- Plug: EU plug
- Cable length: 38cm
- The battery are not included

Battery charger for 12V gel batteries with battery state of charge monitoring. Alligator clip connectors.

TP4056 Module Lithium Battery Charger with Protection features:
- TP4056 Li-Ion Micro USB Charger
- Upgraded version of previous TP4056
- Micro USB connection to charge directly from the PC
- Ideal for 18650 batteries
- Based on the TC4056A regulator
- Input Voltage: 4.5V - 5.5V DC
- Full charge voltage: 4.2V +/- 1.5%
- Max Output Current: 1A
- Overvoltage protection 4.2V
- Over discharge protection 2.4V
- LED indicator: charging blue, charging red
- Operating temperature: -10ºC to + 85ºC
- IN + and IN- connection for electronic circuits
- Overcurrent protection: 3A
- Measurements 26 x 19 x 5 mm
- Possibility of current change through Rprog

Solar Power Manager (C), Supports 3x 18650 Batteries, Multi Protection Circuits. Compatible with 6V~24V solar panels, Rechargeable from solar panel or C-type power adapter. 5V/3A regulated output.    

The high-precision 5V2A charger for Li-Ion 18650 batteries has a USB-C connection for powering the module. It is also equipped with a USB-A connection for charging.

TP4056 5V Micro USB Lithium Battery Charger Module features:
- Based on TP4056ES regulator
- Lipo micro USB Li-Ion charger
- Input Voltage: 4.5V - 5.5 VDC
- Full charge voltage: 4.2V +/- 1.5%
- Max Output Current: 1A
- Indicator LED: charging red, charging green
- Operating temperature: -10ºC to + 85ºC
- IN + and IN- connection for electronic circuits
- Battery protection against over-discharge voltage: 2.5V - Protection against over current battery: 3A
- Measurements: 25x19x5 mm
- Ideal for 18650 batteries

Charger 4 x 9V 6F22 with EU Power Supply Cable features:
The everActive NC 109 charger is a unique, specialized design that allows you to charge from 1 to 4 pieces of 9V Ni-MH batteries - each cell is charged individually.
It allows you to charge up to 4pcs of 9V batteries simultaneously, in any configuration / combination, with any capacity, any manufacturer.
The charger has 4 independent charging channels.
The most important features: of the NC109 loader:
- quick charging of a large number of batteries simultaneously - ideal for industrial and professional applications,
- individual LED indicator of charger work for each cell - with full charge signaling,
- 100-240V AC power adapter included, optionally a 12V car adapter is available,

Charger 2x18650 with EU Plug Cable features:
- This product is very convenient and easy to use
- Black
- Material: metal and plastic
- Weight: 74g
- Input voltage: AC 100 -240 V 50/60 Hz
- Compatible with: 18650 Li-ion
- When the 18650 battery is connected to the charger, the red LED light will be displayed, and means green in full charge status
- Output: DC 4.2 V, 650mA
- Plug: EU plug
- The battery are not included

In the case of a battery pack, the BMS (Battery Management System) balancing protection circuit allows charging and discharging to be individually controlled. That is, the circuit controls that all cells are charged and discharged at approximately the same voltage. The current during charging should be limited, because the cell will "absorb" the current given to it, but a higher current than the one established by the manufacturer (generally a safe current is 1C ) can cause the cell to overheat and, in extreme cases, explode. The same relationship also applies to discharge.