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@OnTheRoadAgain - Thanks very much - well the PSU looks like it was the issue. Brand new, displays looked good and wasn't doing what I thought it was. Meh...what a pain.

Don't worry I know my elec' eng :) Not going to change the voltage. the connections are fine, amps are too low to cause the clips any issues. This is all through BMS now

Cheers Steve - probably what i didn't make clear is that the cells are only wanting to draw 7ish Amps. I can crank the PSU up to 40Amps but as it stands at the moment that wouldn't make a difference as they wouldn't pull that.

Think I found the answers to these questions: https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/ Under "Charging an LFP Battery" section :)

Hi, I bought 4x 280Ah cells from Nikkie @ Dongguan Lightning New Energy Technology. (https://www.alibaba.com/product-detail/4pcs-batch-LF280-LEP-3-2V_62483436488.html?spm=a2756.order-detail-ta-ta-b.0.0.a87e2fc2XZgpd7) They finally turned up the other day. I've top balanced them and they...

Hi all, Just need some advise re: settings for my solar charge controller. Setup is: 4x LiFePo4 batteries - 12v configuration 1x https://overkillsolar.com/product/bms-120a-4s-lifepo4 Charge Controller EPSOLAR Tracer BN series controller - (Currently used for AGM batteries) where I can set...

Yeah that's what I thought - saw that info [re: the battery chem] here https://www.earthtechproducts.com/duracell-powersource-1800.html and here https://www.alliancemro.com/DR660PSS-Duracell-PowerSource-660-Gasless-Generator. I guess that's why it's cheap - selling off old tech?

I'd be tempted to make a project out of it - removing the "Features an AGM Sealed Lead-Acid 660 Wh/55Ah (12v) Battery." and "dropping" in a LiFe battery :)