Most companies use normal tap water to top up the batteries. This water contains harmful conductive substances which will reduce the ability of the cell to deliver to it’s rated capacity and will reduce the expected life of the battery. CPR Batteries produces de-ionised water on its own premises which is used on all batteries that are maintained by CPR.
Fully charged specific gravity should be in the range of 1.255 to 1.295 at 25oC.
Overcharging is another form of abuse, which can have a serious effect on battery life. It is therefore important to check battery voltage and charge current from the charger’s ammeter, and compare it with the recommended rate.