I hadn't but it appears that the Ducellier brand name (originally a French automotive parts maker) as applied to batteries was a brand or label manufactured by Central African Batteries of Harare. The company was placed into Judicial Administration in 2018, and at the time was seeking a capital injection of $2.6 million to keep trading, with a total cash injection requirement of $8 million over the following 5 years.
What happened regarding that I have no idea, but Battery King Investments of Zambia now appear to be the sole distributor of Ducellier batteries.
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Unfortunately, I doubt you will find anyone on this forum who has heard of them or has an opinion, unless you are lucky enough to find another contributor from your area. Are there any car clubs etc. or more generalised local automotive forums whose members might be able to give an opinion.
I am guessing, but might be wrong, that the name Ducellier was bought as a brand name form its original owner or their liquidators, in this case with a right to place it on car batteries manufactured by the acquiring company. Thye same happens in the UK with a plethora of brand names, one rather well known name being Lucas. Whilst the Lucas name continues to be used by several companies who obtained the right to use it in relation to various products, Lucas batteries are a label attached to batteries manufactured by an Asian battery manufacturer, who also sell the same identical batteries under several other label names, all designed to give the British consumer a false impression of choice and diversification.
Something similar happened to the Karrimor outdoor clothing brand many years ago - originally a British manufacturer held in reasonably high regard, but following financial difficulties and its failure, the name was bought by several entities to be used on their own cheaper mass-market products, Karrimor trainers being one example that was owned by one of the High Street "pack 'em high" discount sports shoe retailers.
Ducellier may of course be a decent brand, but I've never seen or even heard of it being sold here. So all I can suggest is trying to find a forum or club local to you, whose members may be able to give an opinion. But if the "big" battery brands previously mentioned are sold in your country, personally I'd still be pushing for one of their products in preference. A quick google of British online battery suppliers hasn't thrown up anything obvious with a similar case moulding, which might indicate the underlying manufacturer.
Some of the battery case mouldings seem fairly unique, from the pictures on the site of the distributor.
They also distribute tyres under the Doublestar brand, made in China. I hadn't heard of them either, but it appears that their tyres are sold in the UK as a budget brand.