Yes this unit can be used with a 20Ah SLA battery. Since it is established these batteries are likely bad, we suggest extra precautions when attempting to charge:
· Check voltage of each battery, if below 3 volts the charger will not turn on. Replace battery.
· Set the Charger to 4 Amp charge.
· Charge away from people and property.
If the charger detects sulphation it will automatically go into the desulphation mode (blinking yellow light and LED screen scrolls). The charger will make up to 5 attempts to do a 5 hour regimen of desulphating. At the end of this cycle it will either charge the battery or it will read F01 (Replace Battery). The F01 code may appear earlier if the battery is really bad.
Have the batteries load tested afterward to see if they are any good (they may read 13 Volts but when used they drop rapidly in power). Desulphation mode will not make a bad battery good, it will help to get rid of buildup, but it cannot overcome a badly sulphated battery, no matter how many times it is put into this mode. Best practice is to replace all batteries at once. When mixed together the older battery will ruin the new batteries. Canadian Tire has SLA batteries available in 18Ah (model 10-2020) and 26Ah (model 10-2041) as well as many other capacities.
answered 1 year, 11 months ago
Yes, our battery charger can be used to try to do re-conditioning for your batteries. Please just hook the charger on you battery one by one, charger will detect the battery condition, if it finds your battery need to be reconditioned, it will move to the re-condition mode automatically, you do not need to do anything. Everything is automatic. If your battery is too sulphated, the charger can not save it, you will get flashing 888. In this situation, you need to buy new batteries.