Battery Tender Plans for NiCD NiMH Lithium
Trickle Charger For NiCD NiMH Lithium
Unless you use your cordless tool batteries, everyday, they sit and when you do need them they often don't have a full charge from self discharge. Fast chargers are quick, however, they reduce the charge/discharge life cycle number from gassing which can't be reabsorbed as quickly as the gas is generated.
Mike from Michigan shows you his solution. He built this handy trickle charger / battery maintainier.
It slowly charges NiCD, NiMH, and Lithium up to 18v. it can easily be built to include up to 24v. This device keeps your batteries fresh and ready for use for years by leaving them hooked until needed. It can easily be used with 120v or use with solar panels for a Solar Trickle Charge in remote barns and locations. It has onboard ammeter for individual current adjustment up to 100ma.
This file is included in Mike's "Handyman Projects", which now have 40+ files and can be updated for any new files that get added to it. Check out the "Handyman Projects" file here
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