@Hristo, in addition to the Purism source, I know of at least one source that works well for me, as already published this original product photo here. And sure that I can do some comparison (measure real mAh capacity by performing full charge/discharge cycle and/or quickly measure used battery internal resistance that relates to the “age” of any particular battery) tests but currently no time for such on my own (yet confirming that I can rely firmly on this 4400mAh battery). Further info about related 1ICP10/57/53 battery you will get here: subtel GmbH - Mainzer Str. 3 - 10247 Berlin - Deutschland. And link toward this (another) Librem 5 related (QA for certain) battery is here (+ https://www.ebay.de/itm/195237105943), distinguished original product of its own (product that isn’t fake, while includes ★ 3-Year Guarantee ★, and not even having any other markings that might lead you wrongly).
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