have only have the new battery for a few week , but , so far , it work as advertise . actually , it be not what I order ; the ni-cad replacement battery . I receive the newer nimh battery instead . no problem , tho , as they say it work with the old charger , and it seem to do just that . I use my original ni-cad battery for close to 7 year , and it still work pretty good , but I have have to charge it every day for the past couple of year . I use my light for at least 30 minute almost every night , and the new battery hold it be charge for several night before I recharge . when these battery discharge , they go dead all at once . there be no gradual discharge as with old battery so do not get catch need light with no way to charge-up . this be a great flashlight ; the best I have ever own , and these new battery be do they job . only Time will tell if they be go to last anywhere near as long as the original do .