Path: ...!goblin2!goblin.stu.neva.ru!aioe.org!peer02.ams4!peer.am4.highwinds-media.com!news.highwinds-media.com!fx08.am4.POSTED!not-for-mail Newsgroups: rec.food.cooking Subject: Re: O. T. - - - NiMH Battery Question - - - O. T. From: Pamela References: <7cc24edf-92c8-4993-a9ea-276e58d003cd@googlegroups.com> Message-ID: User-Agent: Xnews/2009.05.01 Lines: 31 X-Complaints-To: abuse@usenet-news.net NNTP-Posting-Date: Tue, 05 May 2020 10:23:00 UTC Organization: usenet-news.net Date: Tue, 05 May 2020 11:22:27 +0100 X-Received-Bytes: 2168 X-Received-Body-CRC: 2049473825 Bytes: 2398 On 23:51 4 May 2020, itsjoannotjoann@webtv.net said: > > I bought a new rechargeable NiMH battery for a Bissel cordless vacuum. > It's charging and I will leave it to charge 12-15 hours. I read online > that the first 3-5 times I should let it discharge completely to build > the battery up. > > My question is should I recharge it 12-15 hours each time I run the > battery down? If not, how many hours should I recharge it those first > 3-5 times? Sorry, but this bit of information was not on the site I was > reading. Only the initial charge needs be very long. After that just charge and discharge normally. This site is authoritative: "Battery manufacturers recommend that new batteries be slow-charged for 16–24 hours before use. A slow charge brings all cells in a battery pack to an equal charge level. This is important because each cell within the nickel-cadmium battery may have self-discharged at its own rate. Furthermore, during long storage the electrolyte tends to gravitate to the bottom of the cell and the initial slow charge helps in the redistribution to eliminate dry spots on the separator. Battery manufacturers do not fully format nickel- and lead-based batteries before shipment. The cells reach optimal performance after priming that involves several charge/discharge cycles. This is part of normal use; it can also be done with a battery analyzer. Quality cells are known to perform to full specifications after only 5–7 cycles; others may take 50–100 cycles. https://batteryuniversity.com/learn/article/charging_nickel_based_batteries