Which is the better state for rechargable Batteries!!

Forget everything you know about Nicads. Almost all modern battery tools use Lithium batteries. I believe the Ryobi ones (like many others) have smart charge circuits in each battery, that takes care of balancing, etc.

Lithium prefers not to be flattened fully, and the optimum charge for long-term storage is 60-70%, not empty or full. The self-discharge rate is basially zero compared to anything previous.

It doesnt matter with current Lithium Ion batterys.

Daniel65 is an IDIOT wrote: ========================

** And I was Napoleon. ** 1960's ?

** Mostly myth. ** Not true. ** There are no NiCds in your mower.

...... Phil

Ah!! So much the same as Ni-Cad, then. Thanks

--
Daniel

No, if you treat them like Ni-Cads you will destroy them, even the new smart ones with charge/discharge limiting circuitry built in to them.

Charge it up, use it, and if it gets low charge it again, other wise leave it on the shelf until you need to use it.

If you know you are going to use it a lot tomorrow, charge it up today if it's not full.

Cheers, Gary B-)

Daniel65 wrote: ============= >

** A bind man once met an elephant. He grabbed the animal by the tail and exclaimed:

" Ahhh .... elephant just like snake "

....... Phil

No. One area NiCd differs is that it can withstand continuous low-level overcharging. NiMH and Li batteries die from that kind of treatment.

CH

Clifford Heath wrote: =================

A blind man said: =================

** However, trickle charging is OK.

Most NiMH cells suffer from high self discharge rates. Only 1 month and they are almost useless. ( Eneloop ones are far better)

Trickle charging at about the 30 to 50 hour rate is OK.

...... Phil

Sorry, should have mentioned it is Lithium-ion.

If I were to "leave it on the shelf" for a month or so (How often do people mow their lawns?? Often in Spring, not so often rest of yer??), would the Lithium-ion battery still be holding a charge??

Yes, that's always an option as it only takes a couple of hours on the charger to be fully charged.

I was just wondering .... for the long-term good on the Battery.

Thanks to all for their responses. ;-)

--
Daniel

Also, if a NiCd ever gets totally flat, you can just charge it and use it, sometimes even many years later (if it doesn't develop shorted cells, or if you succeed in blasting away the shorts with a high current pulse, which I have sometimes). If a lithium battery ever gets totally flat (or even below about 2.3V per cell I think), the electronics in the pack may prevent you from ever charging it again, (perhaps for safety reasons). If storing a lithium battery for a long time, it is best to charge it to maybe 60% so that it won't get too flat by self-discharge, and then store it in a cool place. Charging it to 100% before storing it is not a good idea as that causes faster degradation.

This is interesting, though I can't vouch for its correctness:

On 14/02/2022 19:37, Daniel65 wrote: [SNIP]

Yes, we realise that.

My jump-starter is LiFePO4 - Lithium Iron Phosphate (supposedly the latest and the greatest :-) ) - it says check every six months and /if/ it's dropped below 70% top it up.

The Bunnings Ozito PXC batteries say they lose 5-10% a month, but they don't appear to specify a trigger point for re-charging. I haven't noticed any of mine going low enough to worry about, I just charge them after use and toss them back in the bag when they've cooled down, they get used once a month or so.

Don't leave them on charge, don't let them get and stay low, store them where the temperature is fairly stable, that's about it.

Cheers, Gary B-)

Daniel65 wrote

Right thru spring, summer and autumn. Not much in the winter.

Varys with the tech. No problem charging it before use with mowing tho.

Thank you. ;-)

--
Daniel

Charge and leave them that way they will be ready for use when you need them. Forget NiCads, not relevant here.