Solar 18650 battery charger, with 5.1v 1A USB power supply.

Charging board – tp4056 – More info here –

Note I used a different board than the one in the link, which uses 2 tp4056’s and comes without any usb connector soldered to the board.

18650 cell – Panasonic NCR18650A (Protected)

Specs from “Orbtronic” site –

3.6V storage charge
Typical Capacity – 3100mAh
Minimum Capacity – 2950mAh
Nominal Voltage 3.6V – 3.7V ±0.025V
Full Charge voltage – 4.2V
Max. working discharge current – 6.2A 0ºC to +40ºC
Max. discharge current – 8.5A 0ºC to +40ºC
Discharge cut-off voltage 2.5V
Protection Activated
PCM Over charge Protection 4.325 ±0.025V
PCM Over discharge protection 2.5V ±0.025V
PCM Over current protection 8A ± 0.3A
Storage Temperature
-20ºC to +60ºC Less than 1 month
-20ºC to +45ºC Less than3 months
Weight 48.5 g / 1.71 oz
Size 68.9mm(H) * 18.4mm(D) (+/- 0.3mm)
Bottom plate Copper Cu
Max charge current: 1C 3.1A
Recommended charge current .3C 0.9A

Energy – 11.2 Wh

Never completely discharge li-ion battery ( below 2.5V ).
Charge fully before first use.
Never use force to install (insert) li-ion battery.
Use only high quality battery chargers.
Do not expose to heat.
Do not short positive, and negative battery contacts. (Keep battery that is not in use in plastic holder)
Do not charge battery over 4.29V (another reason to use good battery charger).
Do not charge unattended.
Do not store your li-ion batteries fully charged (for extended period of time).
Store in cold and dry place at approximately 3.7V (storage charge).
Never try to charge (or discharge) li-ion batteries with battery chargers that are not made for Li-ion batteries.

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