I have a Boscam RX-LCD5802 Diversity 5.8ghz Monitor with built in 7.4V 2400 mAH Lipo Battery. A friend has the same monitor but busted his LCD screen so he gave me the whole thing. Can I pull his battery and run it in Parallel with mine to get double the mAH? And can I charge the setup using the stock 2000mAH 12V charger. Should work right?