[lolita]

For Actions chipset, charging circuit is calibrated to the original battery and so will limit the charging current to safe level for the original battery. Other chipset should be similar.

Charging Lion battery at higher than its maximum safe current will cause fire/explosion.

500mA is more than enough already. Lion battery should not be charged above 0.8C, most charging circuit in MP4 charge at around 0.5C or less to prolong battery life.