How long to charge 9v nimh battery

Started by AK in sci.electronics.basics9 months ago 4 replies

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy


Wanted: A 'joule thief' style circuit design...

Started by ~misfit~ in sci.electronics.basics3 years ago 15 replies

... that I can use to drain alkaline cells and push the 'charge' into either a lithium-Ion cell (for a flashlight), a phone or a powerbank. I...

... that I can use to drain alkaline cells and push the 'charge' into either a lithium-Ion cell (for a flashlight), a phone or a powerbank. I have a combined wireless doorbell - inside/outside thermometer that I quite like. Unfortunately it won't run on NiMH cells and only uses alkalines down to 1.33v. (It's the only thing I have that doesn't run on rechargeable cells.) The sender uses...


Overcharging NiMh batteries?

Started by Bill Bowden in sci.electronics.basics7 years ago 3 replies

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a...

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a single 1200 mAh 1.2 volt rechargeable battery and a couple small solar cells to charge the battery. I measured the load current at 15 milliamps and the charge current at only 1.3 milliamps so it appears the solar array is not charging the battery ...