the charger is x Volts ...y Amperes( maximum allowed current ) ...on pulling the current above this, it will get hot so may will fry.
the battery is z Volts t Amperes ( maximum charging current ) .... on charging the current above this, the battery will be damaged....risk of explosion!
1-if x is more than z, the resulting current, if more than y , damages the charger ...if more than t, damages the battery.... or explode it.
2- if x is less than z, there is no current so no charging.
on cellphone the temperature of battery is controled if it pulls more current, the conroller will switch off the battery.... to prevent explosion ...
now check the parameters.