As stated before you will need the batt protection circuit mentioned. There's almost certainly a center tap. 7.4 v packs tend to be thicker (since they are usually 2 cells piggybacked). You'll have to deal with all of these problems if you opt for a 7.4 pack. The manufacturer probably didn't go to 2 cells on a whim.Ideally in a high capacity modded job, people will get a real Lipo balance charger and pull the center tap out to a special charge connector. That's the safest way to go, and it will give you the longest battery life in terms of cycles, as well as shorter charge times. Pay attention to the C ratings of Lipos both for continuous rating, and for charge rate. 1C for a 3200 mah battery is a 3200 mah rate. So a 1C charge rate allows a 1 hour recharge, minimum at 3200 mah maximum.Lipos need a low voltage cutoff circuit, or they are damaged. Over-discharge can result in explosion or fire. Don't screw around if you don't know what you are doing.By the way, ever wonder why the Moonse has a 3000 mah pack and the Eken a 1600, yet they both get the same numbers of hours of run time? The Eken uses 7.4 V (2 cells) while I believe the Moonse uses 3.7 V (1 cell). If so, total watt hours is similar Eken = 7.4V x 1600 mah = 11.8 Wh. Moonse = 3.7 x 3000 mah = 11.1 Wh. Actually, the Eken has slightly more juice aboard than the Moonse. That's why it's important to look at not just the battery's amp hour specs when choosing a computer for long running time, but the operating voltage. One way to tell that is the power supply DC output, as marked on the wall wart. Generally a 9V wall wart is going to be powering a 2 cell lipo computer, while something about half that voltage is going to be powering a single Lipo cell design.