I'm definitely going to try this once I have the second battery available to me later.+1 For Airportable's advice. Put a pair of jump leads between yours and a 2nd battery. Then attach the battery charger and leave it like that for an hour or ideally several. Then take one of the jump leads off and leave the charger working on just your battery alone. Check that the charger is now applying a charge and if so now leave it to charge for several hours.
You mentioned you had got/ were going to get a multimeter. What is the voltage reading across the battery at present ? This would quickly confirm why the load tester could not show a reading.
As for the multimeter, I misplaced mine some time ago so waiting for the new one to arrive from Amazon at some point today. Annoyingly they got sent as separate deliveries. Once it comes, I intend to confirm the actual voltage on the battery currently.
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