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AC/HL · 7th Dec 2014, 4:45 pm

A quick Google came up with this:

Battery charger
The Crypton model HC3 battery charger.
To meet the demand for a reliable battery charger at a reasonable price, Crypton Equipment (Thorn Group) has introduced the model HC3 which has an output of 3amp and charges both 6 and 12V batteries.
The specification includes a slide-action change-over switch, strain-relieving cable bushes, permanently identified charging clips and an easily replaceable fuse. The transformer is double wound; selenium full wave rectification is used and a reliable clear scale meter is fitted.
Made by: Crypton Equipment. Bridgwater, Somerset.

Doesn't sound anything special, yours is presumably a fixed voltage variant.

7th Dec 2014, 4:45 pm	#16
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: 12V Charger A quick Google came up with this: Battery charger The Crypton model HC3 battery charger. To meet the demand for a reliable battery charger at a reasonable price, Crypton Equipment (Thorn Group) has introduced the model HC3 which has an output of 3amp and charges both 6 and 12V batteries. The specification includes a slide-action change-over switch, strain-relieving cable bushes, permanently identified charging clips and an easily replaceable fuse. The transformer is double wound; selenium full wave rectification is used and a reliable clear scale meter is fitted. Made by: Crypton Equipment. Bridgwater, Somerset. Doesn't sound anything special, yours is presumably a fixed voltage variant.