Current Limiter -- How to limit 16v 3.36a to 16v 1a?
Applying 16V to a lead acid 12V battery is a bit steep so try using a 2 ohm resistor in series to drop the voltage on the lead acid to about 14V. Voltage dropped is 2V and with the resistor being 2 ohm the current taken should be about 1 amp. Power dissipation of the resistor will be 2 watts but the resistor should be rated more like 10 watts for when a more discharged battery is applied.

This is probably the simplest method and you could look to using some silicon to provide better regulation.

You could even use three silicon diodes in series to drop maybe 2 to 2.5 volts. The continuous current ratings og the diode need to be round about 5 A just to be on the safe side.