Summary and some advice on the way on batteries

Select the battery type according to the desired capacity, performance and cost
Never undersize the capacity of the battery – An oversized battery lasts longer
When a battery ages, the capacity decreases
Therefore, dimension the system for an aged battery, eg 50% of stamped Ah-numbers
Never leave a lead acid battery discharged – it will be destroyed in months
Maintenance charge a lead acid battery at least every 3 months if stored.
Recharge the lead acid battery to 100% as soon as possible
Never overcharge a battery
Select a quality charger with precise settings of charging voltages / currents
Select a lead acid battery charger with temperature-compensated charging at ambient temperatures greater than +30°C or less than +15°C
Select a charger that automatically test and recharge the battery in several steps.
Select a battery charger that can always be connected without overcharging the battery.
Select a Tystor battery charger – all of them has an auto Recond function built-in
Calculate the minimum size of the charger for a lead acid battery according to the simple rule of thumb: 10% of Ah in A (example 100Ah x10% = at least 10A charger is required).
Do not forget to add any consumers simultaneously connected. In the example above, a 15A charger is required if you have 5A load while charging the battery.
Highest recommended charger for a VRLA battery is calculated as 25% of the Ah number. Example: 25% of 100Ah = max 25A charger to be used