9V (E) NiMH battery recommendations  - Page 1
Forum section: electronics / general

author: matthuszagh
author_rank: Frequent Contributor
timestamp: November 11, 2022, 04:10:11 pm
content: I'm looking for 9V (preferably) NiMH rechargeable batteries. I use eneloops for AA and AAA, but they don't come in the 9V form factor. Any recommendations? What do people like?

author: Black Phoenix
author_rank: Super Contributor
timestamp: November 12, 2022, 10:37:00 am
content: I can't talk from experience but we have some users here who use the brand EBL for such case.Personally I've been testing the 9V Lithium from GP Battery on my 87V. It is a snug fit since the plastic case is some millimeters more thick than the normal alkaline battery but it closes the door.

author: Gyro
author_rank: Super Contributor
timestamp: November 12, 2022, 10:41:21 am
content: Yes, I've been using EBL. They seem to have reasonable shelf life and operating life given their stated capacity.

author: mariush
author_rank: Super Contributor
timestamp: November 12, 2022, 11:20:09 am
content: It doesn't answer your question but..They make rechargeable lithium batteries in 9v battery shape. Usually they have a microusb or usb type connector and they can be charged directly with a usb charger. You get more capacity and faster recharging, but probably a bit more noisy output (as there's gonna be a dc-dc converter boosting 3..4.2v to around 9v internally

author: magic
author_rank: Super Contributor
timestamp: November 12, 2022, 04:42:09 pm
content: They also make Li-ion versions with two cells in series. Maybe a good choice for devices that are happy with slightly lower voltage (7.2V nominal most of the time, down to 6V before safety cut-off).Myself, I have a Varta NiMH battery which can't fit into some devices due to sharp corners and a GP ReCycko with the usual rounded corners. Both work so far.

author: rdl
author_rank: Super Contributor
timestamp: November 12, 2022, 05:17:14 pm
content: I use the EBL 9 volt lithium-ion batteries. Pretty sure they're 2 cells stacked. Right off the charger they'll be around 8.7-8.8 volts (if I remember right, been a few years since I checked them). They have a nice discharge curve and stay well above 7 volts for the first 90% or so. One place I use them is in a thermometer that's always on and I have to recharge every month, been doing that for almost 5 years and the batteries are still working fine.

author: rdl
author_rank: Super Contributor
timestamp: November 13, 2022, 11:28:35 pm
content: Update. Apparently I remember wrong. I charged four of them last night and hot off the charger they are 8.33-8.35 volts. This is still plenty good.

author: slugrustle
author_rank: Frequent Contributor
timestamp: November 15, 2022, 12:07:42 am
content: The Powerex MHR9VP is a low self-discharge "9V" NiMH battery that lists as 9.6V nominal with 230mAh capacity:https://mahaenergy.com/powerex-precharged-9-6v-230mah-1-pack/.I just bought some with the associated MH-C490F charger (https://mahaenergy.com/mh-c490f-9v-charger/) but haven't used them yet. I'm waiting until the alkaline 9Vs that they're intended to replace wear out.

author: bdunham7
author_rank: Super Contributor
timestamp: November 15, 2022, 12:11:25 am
content: Quote from: slugrustle on November 15, 2022, 12:07:42 amThat looks promising as it appears to be an 8-cell version. Less mAh than an alkaline, but still likely useful for 9V DMMs and such.

author: edavid
author_rank: Super Contributor
timestamp: November 15, 2022, 01:00:31 am
content: Quote from: slugrustle on November 15, 2022, 12:07:42 amThey cost 3 times as much as the 2 cell Li-ion batteries, and have 1/3 the capacity

author: bluey
author_rank: Regular Contributor
timestamp: May 02, 2023, 09:13:19 am
content: On the basis of the suggested EBL by others, I got 2 boxes of 4 from Amazon to replace the Toshiba 8.4V NiMH that have died.The new EBL test at 8.94-8.97V. They are apparently low self-discharge types marketed for smoke detectors and claim 280mAh capacity.Seeing that they cost about the same as alkaline 9V, they are an economic no-brainer. Don’t have high expectations for longevity compared to Varta 200mAh NiMH which cost 3-4 times as much.