Just about to order a new AGM battery for my Westie, I currently use a NUMAX P/n121000 10a smart charger, but have been informed by Tayna that it’s not ideal for AGM batteries and need a Ctec one another £125 , is anyone using the numax on there AGM batteries and are they working or not, currently out of action due to two ten day isolation and now torn knee ligaments so if I don’t need to spend the extra I won’t, 2012 Range Rover Westminster 4.4 TDV8
2006 Discovery 3 HSE 260k miles and still going strong with a new owner

Not exactly what you asked, but I use a CTEK MXS 5.0 on my AGM and it works perfectly... just incase you wanted some feedback on the CTEK

I also use it on my leisure battery and my race car battery, very versatile  2010 MY Range Rover 3.6 TDV8 Vogue SE - Stornoway Grey with Semi-Aniline Ivory Leather and Piano Black Trim

https://www.fullfatrr.com/forum/topic58777.html

I got the CTEK MXS 5 and it wasn't powerful enough for my battery so upgraded to an MXS 10 . Fantastic bit of kit and worth every penny

I keep my 2011 TDV8 on trickle charge using the CTEK MXS 5.0 and haven't had any battery issues, charges fine and keeps it topped up perfectly 2011 TDV8 Vogue SE

Ctek Mxs 10 here via a towing socket adaptor into 13 pin electrics 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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Ctek 7 here... connected through towing electrics. Used it for years and good on AGM.

Get one from Amazon whilst they have a deal on......

https://www.amazon.co.uk/s?k=Ctek+M5’s+7&ref=nb_sb_noss

Click image to enlarge

Thanks for all the reply’s guys, I’m assuming no one has used the numax I just wanted to make sure If it was safe to use or if I needed to change to a ctek 2012 Range Rover Westminster 4.4 TDV8
2006 Discovery 3 HSE 260k miles and still going strong with a new owner

Hi Furnitureman,
Sorry not used the numax, but I do have a ctek 5.0 charger and an Aldi charger, functionally there is no difference between the two, they do the same job for me.
But you can buy 5 Aldi chargers for the price of one ctek!

Worth Thinking about

David Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours