Sure you can, but make sure it's on the lowest charge setting possible, usually 1.5amps. If the charger has no auto shut-off, you'll need to check on it often. I recommend you do that anyway. I use a solar trickle-charger to charge my 12v 5ah bike battery, but I've used an automotive one several times.
Any faster and that battery's case will expand like waistlines on Thanksgiving because of boiling electrolyte.