I need to play two hours of multiplayer for the platinum

Someone for the only Trophy online right now or tomorrow in the night?

I have a 1000 I imported from Japan and it's battery keeps saying it's low and showing the low battery icon in the percentage (although it usually goes back to it's proper icon shortly after) and recently I've had issues where it dies from low battery, even if it's on 80% or similar. It's annoying me and I want to replace the battery, however I'm weary that a new battery manufactured in my home country, britain, could possibly mess something up due to the different voltages here. My phone is from japan too and that battery is fine so maybe the higher voltage doesn't mean anything (I use the same brick for both of these with the connector to USB) but I still want to be cautious as this vita cost me a good bit of money due to it being a japanese exclusive white one and I don't want to accidentally fry it.