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Message: <blockquote data-quote="Skylark" data-source="post: 753203" data-attributes="member: 1555">You get some nice little led volt meters from eBay, R15 each, maybe integrate one to monitor the battery level. With li-ion cells/batteries you preferably want to recharge early/not run them hard or discharge them too far down, so once the cells hit around 3.3v you know it's time to recharge. If you can get your hands on some old laptop batteries I'd highly recommend trying to build a small battery pack. Decent 18650 cells hold 2000-2500mAh each, 4 will give you huge runtime. You build the packs in series to get the voltage you want and then parallel more cells to increase the capacity. Theres a few different configurations depending on if you want either high voltage or current or a combination etc. I've seen high quality 18650 battery housings on eBay with integrated cell balancing/management for R150, all you need is 4 cells, a charger and a little led voltmeter/ammeter to monitor it all.</blockquote>