My knowledge of things electrical is, I am ashamed to say, poor - not to say non-nexistent. I’m hoping some kind person on here who knows about such things will have pity on me and help me resolve a little problem:

The battery on my sit-on lawn mower has recently been playing silly B’s. Normally the mower starts with no problem when it has been left for a week or so but on 3 occasions recently the battery was dead as a dodo.
The mower is 18 months old, the battery (12v, 16 Ah) is stamped Dec ’19. Now I know the manufacturer’s battery is a cheapo and I am going to replace it as a matter of course but just to check there was no obvious shorting problem I put a multi-meter across the (disconnected) lead terminals on the mower. On the Ohm function setting ‘200’ the display showed ‘1’, so no continuity as expected. Ditto on 2000 and 20k.
However, on a setting of 200k I got a reading of 89, and 458 at 2000k. I believe the last 2 mean there is very high resistance, but would readings like that be normal?
Forgive my ignorance. Any simple explanation would be greatly appreciated!
Thanks in advance
Steve
 It's "bébéchoon", ackcherly, with accents. 'Steve' to my chums.
20 years ownership of Solihull products, ALL GONE NOW, sniff!
Current motor: Suzuki S-Cross 4WD auto, 1.4 petrol. Oh so reliable! 7 years now and no problems. Oh, all right then, a leaking shocker replaced under guarantee.
Previous:
TD6 HSE L322 Auto FF
2.5 TDi 4-door Classic
Disco II
And my 1st Rangie: in 1995, a 2-door VM 2.5 diesel Classic
Not to mention the Lada Niva before those. (I said not to mention it!)

My ride on was less than 2 years old when it began to be an issue to start and I was having to charge it every week.
Despite it being obvious, I finally checked the electrolyte level and found it to be very low. A bottle of distilled water and a good 24 hour charge solved it and I’ve now had 2 more years of it never needing a battery charger.

I can only assume the level was low from when it was delivered but I never thought to check.
Sometimes the obvious can be overlooked  2017 Jaguar F Pace 25t Portfolio - still part of the JLR family 😀
2009 3.6 V8 (MY2010) - my first ever diesel! - now also gone
2004 4.4 V8 Petrol Vogue - now gone

A good call, Chris, thanks.
However I ripped off the 'sealed-for-life' sticker early on in the battery's life and have regularly checked the electrolyte level.
It's OK, so it's not that.
Thanks for the suggestion, though.
Steve

 It's "bébéchoon", ackcherly, with accents. 'Steve' to my chums.
20 years ownership of Solihull products, ALL GONE NOW, sniff!
Current motor: Suzuki S-Cross 4WD auto, 1.4 petrol. Oh so reliable! 7 years now and no problems. Oh, all right then, a leaking shocker replaced under guarantee.
Previous:
TD6 HSE L322 Auto FF
2.5 TDi 4-door Classic
Disco II
And my 1st Rangie: in 1995, a 2-door VM 2.5 diesel Classic
Not to mention the Lada Niva before those. (I said not to mention it!)

 2017 Jaguar F Pace 25t Portfolio - still part of the JLR family 😀
2009 3.6 V8 (MY2010) - my first ever diesel! - now also gone
2004 4.4 V8 Petrol Vogue - now gone