If you're into RC and have electric vehicles and have experience with LiPo batteries, you can skip this, but if not, it's important to understand that messing with lithium-ion batteries can be hazardous. Overall, the lithium battery charges in four hours, and the SLA battery typically takes 10. Tip I don't think I need to remind you to be careful here. Is this what RYOBI recommends? "18650" means the battery is 18 mm in diameter and 65 mm long. The good news is you can fix this by rejuvenating the battery. It will give up before you! That means deep-discharge cycles are not required. Thanks again! Practice shallow discharges with your device. If it says lithium ion or lithium polymer, replace the entire battery or take the battery to a professional for repair. The camera battery didn't do so well. The "0" is just hanging out. Even small batteries can have two small cells inside connected in series or series/parallel. I had forgotten that you can short out on the metal can of the battery if touching the positive or negative terminals. Use the needle nose pliers to remove the tabs by pulling them off. I found a way to satisfy all of the above! Be careful. Depending on the device, the battery will be different in shape or size, but they are usually rectangular and thin for cell phones or compact devices, or cylindrical like 18650 (common in laptop batteries) or 18500 common in hump packs for cameras or camcorders. In most cases I rarely if ever use the corded tools they replaced, despite this there does seem to be a major week point, the batteries. The batteries I have are 4 cell 18650 with built in bmd boards. A number closer to the original capacity is good, but if your cell discharges rapidly, gets warm or hot, and has low capacity, then it's time to recycle it. A couple things I realized are, perhaps, important and missing from this write-up: 1. Unlike NiMH or NiCad batteries, lithium-ion battery packs will have some kind of protection device in them like a battery management system consisting of IC's and MOSFET's or resistors that regulate current, voltage, detect short circuits, reverse polarity, and temperature. You will find out quickly which method the manufacturer uses. I would imagine they are good-quality cells since this is an OEM pack, but who knows? : There are many ways to construct a battery system for a portabel device or vehicle. I learned this the hard way! I'm in the process of rejuvenating a couple of 18650 Samsung Vape batteries. Find out how to prolong battery life by using correct charge methods. Li-ion (lithium ion) batteries do not suffer from the memory loss that Ni-cad (nickel cadmium) batteries do. I checked the data sheet and they are 2400 mAh capacity and rated at 4000 mA discharge current maximum, 4.2 volts full charge and 3.75 volts nominal charge, and 3 volts discharged. Reply NiMH and Lithium Ion batteries rarely suffer from voltage depression due to improvements in their design. Taking a look at the arrangement of the batteries, the laptop battery has 6 cells in a series/parallel arrangement, so 3 cells in series to generate the 11.1 volts, and 2 cells in parallel to double the capacity to 4800 mAh. Set the charger to the LiPo/Li-on mode and charge at a low current, like 200 to 300 mA. Charge the cell again and note the charged capacity and you should have a baseline of how much life the cell has in it. ", Reply Glad you liked it. I have been successful using a sharp wood chisel to cut downward at a corner of the plastic case by tapping slowly and carefully with a small hammer, reducing the likely hood of a knife slipping and cut fingers. I have an affinity for lithium-ion batteries. A super easy hack I discovered to fix a lithium-ion battery! If they have significantly self-discharged, then toss 'em, but if they're still holding the charge then chances are you've revived them, but time will tell as you use them whether you are successful. I'm about half way through doing the second one. Plug the battery into your Lithium Ion charger and give it a full charge. Depending on the type of battery, the basic design is going to be pretty much the same, consisting of a plastic outer casing containing a liner for insulation or cushioning (foam, silastic, tape, or paper), the cell(s), a protection device/board with its internal connections, either wires, tabs, or wires and tabs. Packages come in many different and sometimes bizarre-looking arrangements but if in doubt, check the spec sheet and MSDS (Material Safety and Data Sheet) of any chemical or device you intend to work with. Or discharging it fully takes 10 fingers and hands how i have constructed one for old. 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