Can anyone advise if it would be safe to use a 24 volt 1.8 amp output Lion charger to charge a 24 volt LifePo4 battery whose dedicated charger is 24 volt 4 amp output? I have more than enough 24 volt 1.8 amp chargers and if the only penalty was a much longer charge time I would prefer to use one of them for the LifePo4.