Hi what’s the best/easiest/cheapest way to test 2 6v Trojan 105 leisure batteries.
If low how could I charge these batteries as all the chargers I can find are for batteries rated to 60ah Max. The Trojan batteries are around 250ah
Take them to a retailer that sells batteries, preferably an RV or marine place that deals with deep-cycle types, but an auto parts retailer can test them too. They can tell you their condition - have they dried out, sulfated, etc. and whether they will accept a charge.
Trojan themselves have more info here, including how to inspect and test them: https://www.trojanbattery.com/tech-support/battery-maintenance/
And general info about charging lead-acid: https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery
There's nothing special about these batteries as far as charging. They can be charged with a normal lead-acid charger. It will take longer for the big batteries, but they will charge eventually if their condition is still serviceable.
There is a method to 'restore' sulfated batteries using a pulsed high-current charge. Whether it works or not is an open question.
Ah
is not the same asA
,Ah
is how much the charge the batteries can hold,A
is the speed of the charger, a slower charger will just take longer to charge the batteries.. \$\endgroup\$