Re: "Battery Manager" for a Li ion Battery
Chris has said it all really.
You don't actually need output protection if you are prepared to use the cells carefully. This means recharging them well before they are fully drained, which is easy in some applications but more difficult in others. 18650s are pretty cheap, especially if you scavenge them from scrap battery packs, so the cost of occasionally messing things up and wrecking a few cells isn't great.
I use 2 18650s in my bathroom radio without protection and have never had any problems. I recharge them a couple of times a year.
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