Thank you. I have ordered the charger from aliexpress. It is very reasonably priced.
The web site mentions that the charger is only for 3.8V LI ion batteries and not 4.2V,
but the order says I got 4.2V Universal Wall Travel Charger.
Bit of a worry as the Librem 5 battery says it is 3.8V
This is from the web site.
Intelligent Universal Wall Travel Charger for Cell Phone PDA Camera Li-ion Battery with USB Port Fit Mobile phones, Digital cameras, Mp3 Mp4 players, Hand held gaming devices, PDAs and many more rechargeable lithium-ion batteries at 3.7 volts
Automatically stop charging when fully charged,.LCD screen indicates connection and full charge. Input: AC 100-240V 50/60Hz Output: DC 4.2V 800mA, USB Port Output: DC 5.2V 1300mA (USB)
Just compatible with 3.7 Volts Batteries, Not for 3.8V or 4.2V!!! Otherwise, the battery can not be filled