Instead the pack life is limited by OEMs using cheap cells. NiMH is more sensitive to bad charge/discharge practices, and I have no experience with large packs of this variety, as I’ve avoided them entirely for this reason.įor the various lithium chemistries, dumb charging/discharging is too dangerous to get away with in a commercial product, so at least that isn’t an issue. Replacing them all at the same time is fairly expensive, considering you’ll only get a fraction of their possible life. Replacing only the failing cell(s) results in more imbalances, setting up other cells to fail more rapidly. Have seen these effects numerous times, in my handheld cordless tools, weed whacker, and even in $25,000 portable x-ray spectrometers at work. The higher the voltage of the pack, and the more cells in it, the faster it fails. Then it typically gets placed on a dumb charger which relies only on a long, slow charge to at least prevent catastrophic damage but it still isn’t doing the batteries justice. It isn’t long until one cell gets far enough out of whack that by the time the battery is noticeably discharged, a cell is in full reversal. No individual cell voltage monitoring or balancing is performed. Such a pack has no intelligent circuitry, often nothing more than a inline fuse. An 18V battery pack, built with NiCd’s, requires 18/1.2=15 cells. Posted in Tool Hacks Tagged battery, car charger, cordless tool, power tool, usb Post navigation Compared to their cost, project is very economical if you already have the battery at hand – you can find the USB adapter for less than $10 on Amazon. Or, you can purchase the Kickstarter-funded PoweriSite adapter for DeWalt batteries instead. Both DeWalt and Milwaukee Tool have now created their own USB adapters that connect to their batteries. Tool manufacturers are tapping into the market of repurposing old batteries for charging mobile devices. Since the battery connector is still removable, the battery can be recharged. The adapter was rated 9-24V input, so it was fine to use it with the 18V tool battery. The USB ports were then glued onto the top of the connector. Next, the casing surrounding the cigarette lighter plug was removed so that the adapter’s wires could be soldered to the contacts on the battery connector. ![]() First, removed the battery connector from the bottom of the broken angle grinder. took the simplistic approach, using an old cigarette lighter-to-USB adapter. was facing this dilemma with a Makita battery from a broken angle grinder and decided to make a USB charger out of it. Some people let them sit in lonesome corners of the garage or basement others recycle them. It is the unspoken law of cordless tools – eventually you will have extra batteries lying around from dead tools that are incompatible with your new ones.
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