[Dprglist] Ryobi battery packs

Tue Jun 8 11:11:15 PDT 2021

I have a Ryobi RY401015 mower.  It has not one, but two 6 Ahr 
batteries.  Both batteries can be inserted into the mower, but only one 
is used at a time (selected by inserting a "start key" in one of two 
positions -- it's really just a shunt).  The advertised 70 minute mowing 
time comes from depleting one battery, then the other.  So one battery 
only gets you about 30 minutes mowing time under average conditions.  
Mowing time decreases with grass height and use of the self-propelled 
feature.

John G.

On 6/8/2021 9:59 AM, John Swindle via DPRGlist wrote:
> One mower is too dirty to read anything on it such as faceplate. One 
> is still in its box which says "13 amps". But I don't see a wattage or 
> VA number. So, I don't know if its 13 reactive amps that don't draw 
> power, or 13 amps like a space heater. Not going to tear into the box 
> just yet.
>
> I've never used a battery-powered mower.
>
> A Kill-a-Watt would be nice to see what's really happening, but I've 
> noticed that watt meters from different vendors display radically 
> different results depending on the load's reactance. Even Kill-a-watt 
> can be fooled to report no power being drawn.
>
> Best to you,
> John Swindle
>
>
> -----Original Message-----
> From: Doug Paradis <paradug at gmail.com>
> To: John Swindle <swindle at compuserve.com>
> Cc: dprglist at lists.dprg.org <dprglist at lists.dprg.org>; 
> jjbrockm at gmail.com <jjbrockm at gmail.com>
> Sent: Tue, Jun 8, 2021 9:01 am
> Subject: Re: [Dprglist] Ryobi battery packs
>
> John,
>      Good to hear from you as always. My calculation was based on 
> internet reviews of run time. I may be misunderstanding the battery's 
> specs. They call it a 40V, 6A battery. I made the assumption that what 
> they meant was 6 Ahr. If they mean the output is 40V at 6A 
> that would be 240W (~1/3 hp), and a capacity of 9Ahr for 1.5 hours of 
> life versus the 160W (~0.21 hp) I initially estimated. However 
> they sell the batteries in terms of 40V/2A, 40V/4A, 40V/6A, so I think 
> my original assumption that the "A" value is really Ahr is likely 
> correct. Have you ever owned a battery power mower? I know the 
> Ryobi mowers use brushless motors and very thin light weight cutting 
> blades. Would you share the wattage or volt/amp values from your 
> mower's faceplate? It would be interesting to know what values to expect.
>
>     You have made me curious, next time I'm in Home Depot, might look 
> over the electric mowers' faceplates. It is frustrating how the 
> adverts and mower websites never really tell you anything.
>
> Regards,
> Doug P.
>
> On Tue, Jun 8, 2021 at 7:42 AM John Swindle via DPRGlist 
> <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>
>     Is 160w enough to mow? I think corded electric mowers draw more
>     than a kilowatt. Never measured it, but labels say big amps. (I've
>     only ever owned electric mowers for 40 years. Don't last more than
>     about 100 running hours, so I've had several.)
>
>
>     -----Original Message-----
>     From: Doug Paradis via DPRGlist <dprglist at lists.dprg.org
>     <mailto:dprglist at lists.dprg.org>>
>     To: jesse brockmann <jjbrockm at gmail.com <mailto:jjbrockm at gmail.com>>
>     Cc: DPRG <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>>
>     Sent: Tue, Jun 8, 2021 7:29 am
>     Subject: Re: [Dprglist] Ryobi battery packs
>
>     Jesse,
>         Looking at reviews of the battery it seems a fresh 40 volt
>     6Ahr battery put in an electric lawn mower lasts about 1.5 hrs.
>     This means that the draw for its intended use is 4A (i.e., 160W)..
>
>     On Mon, Jun 7, 2021 at 12:40 PM jesse brockmann via DPRGlist
>     <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>
>         What I wonder is what the current ratings of a Ryobi pack like
>         this is? Can I draw 10c?   😀😀
>
>         On Mon, Jun 7, 2021, 12:33 PM Doug Paradis via DPRGlist
>         <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>
>             Murray and Harold,
>                       Thought you might enjoy this.
>             https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/
>             <https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/>
>
>
>             Regards,
>             Doug P.
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