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Quote: Originally posted by morepints on 02/5/2024

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A bit of judicious googling suggests your battery is this:
EXIDE ER550 MARINE LEISURE DUAL BATTERY 115AH (PORTA POWER PP115) and looks pretty new (£128 from Tanya Batteries)
Colin’s suggestion of a multmeter is a good one, they are quite cheap, about an tenner, and very useful once you get your head around it. Switch it to the 20v battery range, (marked with a sign a bit like = for DC rather than a wavy line which is AC, like mains) and apply the probes to the two terminals, red to red and black to blue. You should get a reading, albeit small if the battery is dead. Now turn the engine on and take another reading. This will tell you if the battery is being charged from the vehicle, and you should get a reading of around 13-14v. Lastly, plug up the mains input and do the same thing. This will tell you whether your mains charger is working.
Voila! You’ve just done your own charging checks!
If the battery is exhausted ( below say 8v) a garage might be able to use a specialist charger to resurrect it
Sorry if I’ve oversimplified, but I tried to assume no prior knowledge.

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