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Ryobi now have some items, tools & batteries, with an additional 'HP' name/label.
The HP batteries are also physically larger, to fit the larger individual battery cells.Ryobi pride themselves that they have used the same 'into the handle' connector since their corporate colour was blue and batteries were NiCad.
The HP tools and HP batteries do have a line of 4 additional contact points, but tools + batteries are interchangeable.
Forgot earlier, I also have a blue Ryobi hedge trimmer and angle grinder that work fine on modern Li-ion (non-HP) batteries.
mespilus
@hugo7 no, I absolutely do appreciate all input. I'm in the fortunate position of having more than 100ft of lawn by a decent amount. Keen to point out I'm nowhere near London to avoid being put in the golf club thread. Current lawnmower is corded electric on a similar size lawn to where we're moving to, and I do find it a massive pain in the arse.
@mespilus any tips for how to figure out whether a given item uses the old 18650 cells versus the newer 2170 ones?
@aggi good shout - I will keep my eyes peeled especially with things like black friday deals not too far in the future.
The Spear & Jackson model I had been looking at was https://www.argos.co.uk/product/8797212?cjdata=MXxOfFl8WXww&istCompanyId=a74d8886-5df9-4baa-b776-166b3bf9111c&istFeedId=36e094b5-4873-4656-8e75-75db46377ddc&istItemId=ixwlpxlwt&istBid=t&$ja=tsid%3A11674%7Cprd%3A100314255&utm_source=Which%3F&utm_medium=affiliates&utm_campaign=IntelligentReach+Argos+Feed&utm_content=13874228&utm_custom1=100314255&utm_custom2=Other&cmpid=cojun&cjevent=2e2eda57637311ee82a079150a18b8fc&dclid=CMLhyJXo3oEDFcSGUAYdbusM8A
Based on feedback here and my own limited knowledge of batteries, I'll keep looking. Sounds like I should prioritize 1) brushless motor, 2) combination of battery voltage and capacity, 3) time to charge batteries, 4) ability to be used with other power tools in the range. Keen to hear if there's other things to consider that I'll be able to see on a product spec sheet (rather than subjective factors like build quality or ability to deal with uneven ground that I'll need to look through reviews to check for).