Yes, that should cause no problem because the voltage is the same (a small discrepancy should usually be tolerable). The larger "mAh" rating simply tells you that the battery will last longer, for any given load.
the 300maAH is volt rechargeable battery is the highest true capacity battery
If you need a battery then there is nothing that can replace it.
fullriver 400mAh
if the battery gets weak and useless, then you have to replace it...
how to replace battery
how to replace a mitsubishi endeavor battery
how to replace a 1990 Chevy Beretta battery
Lift up rear seat & replace battery
no
The battery is located under the backseat, Lift the seat up and replace the battery.
Remove the seat. Remove the battery. Replace the battery. Replace the seat.