"Since more than a year I am using my old Samsung S4 because my Lumia 950XL suffered unpredictable restarts. The problem was the battery having lost its potential.
For months I was begging Wannsee Electronics to produce a replacement for the original Microsoft one. And now it happened!!
I received the battery and can use my beloved 950XL as my daily driver at least until WhatsApp quits – maybe longer.
The battery is available under the label "Polarcell" and I bought mine on ebay."
He links to https://m.ebay.de/itm/PolarCell-Akku-fuer-Microsoft-Lumia-950XL-Dual-Sim-BV-T4D-Batterie-Accu-3500mAh-/392293781288?txnId=907345911026 and this item also appears in other eBay European outlets, all supplied by this German manufacturer.
"Quality is excellent and worth each single cent.
Please spread the word among Lumia die-hards."
Thanks for the report. I'm sure that several readers will be only too anxious to find a decent battery for their ageing 950 XL. The price (£25) sounds about right for a really good battery too. I always shudder when I see batteries at under £10 online because I know they're put together in some Chinese factory with zero attention to QA and performance will be terrible.
Comments welcome if you pick one of these up!