Should be fine....charge at 1c or .6 A, but in this case, .5 A since that is the closest setting. Be sure to trickle-charge the battery after you get home. Peak chargers are like 'battery-hammers', they work, but they don't work well.

Invest in some higher capacity batteries when you move on from the trainer. The 600 mah pack will be fine till then.

When you are ready to invest in a good charger, I like the Triton I got a year ago, but there are better ones available. MAKE SURE YOU GET ONE THAT WILL CHARGE LI-POS, NiMH, NiCD and if you want, Li-Ion.