Stihl ap300 batteries

[Jack.P]

Just wondered anyone finding the ap lithium batteries not lasting as long in the extreme heat?

Usually they would run for most of the day now barely 3 hrs of standard cutting laurel hedges etc ... It has been too hot for hedge cutting anyway and hard work in the heat .5-6hrs enough 

[Oldfeller]

I have a few things using lithium batteries,but not stihl versions,  I haven't noticed any loss of power or run time in hot weather, but the cold certainly seems to affect them in that way.

are they original genuine batteries or knock off copies?

Edited July 12 by Oldfeller

[Jack.P]

1 hour ago, Oldfeller said:

I have a few things using lithium batteries,but not stihl versions,  I haven't noticed any loss of power or run time in hot weather, but the cold certainly seems to affect them in that way.

are they original genuine batteries or knock off copies?

Hi yeah genuine Stihl batteries, definitely seem to be affected from hot weather being in the sun ... Maybe lost some amp hours from overheating 

[Oldfeller]

16 minutes ago, Jack.P said:

Hi yeah genuine Stihl batteries, definitely seem to be affected from hot weather being in the sun ... Maybe lost some amp hours from overheating 

I am aware if through hard use, and taking every bit of power from them, ie; using them until they stop, results in them not charging until they cool down.

Lithium as you are no doubt aware react differently from the conventional lead acid type in the way they discharge, lead will progressively lose power as they get used, whereas lithium put out the same power until the very last moments and then die, I was advised to avoid letting them become completely flat for a couple of reasons, 1,it shortens their lifespan.

and 2, the charger requires a level of remaining input to start the charge cycle.

[Stubby]

2 hours ago, Oldfeller said:

I am aware if through hard use, and taking every bit of power from them, ie; using them until they stop, results in them not charging until they cool down.

Lithium as you are no doubt aware react differently from the conventional lead acid type in the way they discharge, lead will progressively lose power as they get used, whereas lithium put out the same power until the very last moments and then die, I was advised to avoid letting them become completely flat for a couple of reasons, 1,it shortens their lifespan.

and 2, the charger requires a level of remaining input to start the charge cycle.

Also its good to vary when you charge them . Almost fully discharged , partially discharged and only slightly dis charged . Mix it up a bit . The old NiCad were best charged when MT . If you charged them when only partially discharged the could get a memory and only charge up to that point from then on .

[Jack.P]

Also yes I have mixed up the charge cycles a fair bit from new with this in mind .the last 2 times only run flat because they didn't last as long and only realised when it was out of power 

[Jack.P]

Something odd  about using these batteries in the heat .today back to normal with run times but still fairly warm

[Macpherson]

My AP300 batteries overheat and fade quite rapidly if getting used constantly as in blocking up firewood or going through a big trunk and when that happens, they won't charge until they've cooled.

They get to a point where the power drops off noticeably and 

 

On the other hand, if just doing a garden type job where sporadic use never lets the batteries get hot they definitely last much longer ' in terms of how much cutting for 1 charge '.

 

There's no doubt that in any electronic system overheating robs efficiency exponentially, and although I find the battery saw very convenient.... I used my Husky 154 for my last job, what a joy👍😁