thon I've already replaced my stock yuasa battery 5AH with Dyna power.. When I brought my stock battery to a battery charging station for it to be charged, the ammeter doesn't give lift up its finger (still 0). They told me that it is an indication that my battery is already dead and needs to be replaced, that is the moment I bought the dyna power battery. Can I still revive my yuasa battery?
Once a battery is dead,it can no longer be revive so battery health should always be checked. Check charging system regularly and battery fluid if your battery is not maintenance free.
Battery Care 
Some of these occurrences can result in battery damage:
Overcharge - Charging beyond the fully charged stage at voltages greater than 14,5 V.
Can cause explosion, loss of electrolyte.
Action Required:
Check the voltage regulator/switch off external charger.
Undercharge – Charging below 13,5 volts.
Battery becomes “flat”.
Action Required:
Check for faulty contacts, voltage regulator or alternator failure.
Check for loose fan belt/alternator belt and electrical system
Battery not tight fitted in the tray
Battery is submitted to shaking and consequently subjected to external and internal irreversible damages.
Causes acid leakage, long term loss of capacity.
Cables and Connections - Dirty or worn out or broken.
Cause loss of energy to and from the battery.
Poorly tightened cable connections cause terminals heating and sparks that can explode the battery.
Corroded clamps cause high resistance and power loss.
Excessive discharge
If frequent short trips are made in urban traffic with electrical accessories running: (air-conditioning system, an, seat heaters, heated rear window, windscreen wipers, lights, etc.), the starter battery can become flat, even with the engine running. This can lead to starting problems, particularly in the winter.
Current draw
Even when the car is parked, electronic control and storage chips need to be supplied continuously with energy. (Electronic modules, alarm system etc.) They draw this energy from the battery and can consequently discharge it over time.
Short - Circuit - An "external short circuit" can occur if the external terminals of a battery are bridged by any kind of conducting material.
Depending on the battery system, a short circuit may have serious consequences. For example, electrolyte ejection from the battery. This can cause injuries. An explosion may even occur.
peace!
