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Those are the real heroes!

I tried with mine to keep it over 50%, but wasn't always disciplined enough and a few times got far below. But, the percentage displayed in the stock gauge is based on voltage, not on true SoC, so it's kinda meaningless to begin with. 2 years in, I was only getting about 20 minutes per charge...

@Jakeman that's great! Got pictures? I'm a bit confused about the monitor initially showing low charge. This monitor has no way to know state of charge if it's not calibrated. Usually you would have to fully charge the batteries first, then set the monitor to 100%. Then after that the monitor...

My 2 cents on the whole charging thing. I've continued to use the original Delta-Q charger with my converted system and at this point I see no reason to get a different charger. Given that cutting my entire 1 acre lawn uses only about 35Ah, I can easily maintain my SoC very comfortably between...

I think most of us joined just for this thread also! Double-check that these batteries will fit (they should). You might need new connecting cables for the battery terminals and series connections if the Ryobi ones don't work with the terminal post geometry of the new batteries. Hopefully...

Yeah good point. Yes, fuse is on main positive lead. I would also check that all the lug nuts are tightened. I can't imagine how the relay would suddenly go bad. You said you drilled through the panel without removing it. A metal shaving could be creating a short somewhere. Or like USJ...

58.8 V? That would make the average cell voltage 3.675, which is no good. What are the voltages according to the overkill app? Hopefully this is a typo or you have a very bad multimeter. Can you share a screenshot of the app? Are you confident that you installed all the balance leads correctly...

@ryobilifepo4user, i agree with the others that your batteries are most likely not charged. How long did your charge each battery for? With a 5 amp 12V charger, it would take 20 hours per battery to go from empty to full. Definitely not a good charger for your setup.

Sorry to hear. Regarding your first question, it could be a number of things. For starters, I would check that the overall series voltage of the batteries is what it should be (mid 50's, or up to 58V when fully charged), and continuity test on the main fuse. Regarding your second question, it...

Cool, thanks for sharing! I emailed the guy and pointed him to this thread ?

Ah, makes sense. I replaced the only 2 bus bars affected. I'll seal the entrance and keep an eye on things. Thanks!

Opened my box back up to inspect everything and found a couple strange things. My box is not fully enclosed; there is an opening of about 10 sq in. that the power cables go through. Plenty large for stuff to get in, for sure. I expected to find some grass clippings, but not this: I'm not...

@Nizadar Good luck with your conversion. Regarding your first two questions, I'm not sure what is the correct protocol when top-balancing pre-fabricated batteries vs individual cells but I assume it's the same as you describe. You will probably get more responses asking those specific questions...

Thanks for the tip. So you don't think hitting the original torque spec using a torque wrench is sufficient? I suppose that might make it slightly under-torqued on the threads which I thought would be a safe bet.

Not Not me, should have thought of that. Most lock nuts are stainless steel, which worry me might significantly reduce conductivity between posts and bus bars. Found these aluminum ones, a bit pricy but might just get them...

@bobbie_ohio, wow that is terrible news, really sorry to hear. Loose battery terminals is the first thing that came to mind. I torqued mine to 4 Nm (M6 aluminum), but now after reading what happened to you I'm going to open mine up and see if everything is still tight (perhaps everyone should do...

Whoa, this trend continues to blow up!! This is awesome. @icenov, regarding the arrows in your photo: you're correct. The left arrow points to the thermistor, which you ONLY need if you plan to use the original Ryobi Delta charger (I do, so I kept it connected to the charge port). If you're...

That's great! Would love to see some photos of the conversion. Did you ever get this much mow time out of it back when the mower was brand new?

Good luck! For what it's worth, I've been using the original Ryobi charger with my LiFePO without issues so far. The key thing is whether you can trust your BMS to cut off the charge beyond a certain individual cell voltage. The Overkill BMS has an app where I can see (and modify) this cutoff...

Yeah. It has two connectors: one with 3 wires (yellow, black, red) going towards the instrument panel, and another one with a single blue wire going towards the charge port. What USJ did was disconnect the blue wire and connect it directly to battery positive (48v). This will permanently disable...

This may be related to the lockout circuit, similar to what happened to @UltrasoundJelly (see the bottom of post #338). When you turn the key, do you hear the lockout relay "thud"? If not, you might want to try bypassing the lockout circuit like he did. I can't imagine this being related to the...

Can you not return it? For the money of a new mower plus a battery conversion you could just buy an EGO or Greenworks zero-turn. Or wait until the new Lithium Ryobis come out (https://www.toolboxbuzz.com/lawn-garden/lawn-mower/ryobi-new-80v-lithium-zero-turn-riding-lawn-mowers/).

Hi zamondo, I'm not an expert, but I don't think you *have* to charge them separately if you go with 4 batteries in series. As long as their BMS have overcharge protection, then series charging should be fine. If they are well-balanced out of the factory, I think they would hold very similar...

Are you sure it's lithium-powered? I can't find any information online other than the AGM-powered ones (at the prices that you mentioned). These are all the riding mowers listed in the Ryobi website: https://www.ryobitools.com/products/outdoor/mowers/riding-mowers They're all have lead-acid...

I have not. It might be a good idea to reach out to them about this. @AMDPower, do you have a contact point for them? I recall you had some communication with them in the past.

Nice find on that charger! And also nice find on the current adjustability of the AIMS. This makes the AIMS very appealing. I'm tempted to just stick to the Delta charger for now. It seems to me that the main differences between SLA and LiFEPo chargers have to do mostly with what happens at the...

Nice, Jack. That looks great! Those are some serious drawings. I love the power distribution block coming through the box and how you are including the original tie-down clamp. What happened to your mower?

From the measurements I took the vertical clearance is just under 9". The inside of the tray footprint is 13 3/4 x 26 3/4. I considered building the box out of 1/4" acrylic or polycarb instead of wood which would have been a bit pricier, but just as easy to make. If you have access to a welder...

Hi @UltrasoundJelly, that's awesome to hear there's more of us out there! Just to be clear, @AMDPower deserves all the credit here! If you go with the single 48V battery, I bet you can just tie it down using a couple straps, and forget about the bolt. I think having it secured is a good idea. I...

Successful 1st Mow! Only took about 35 Ah total, so plenty left. My yard size is a bit over an acre, with some steep hills. Suck it, Ryobi! Opened the box back up right after and touched everything (lugs, bus bars, BMS) and it's all cool to the touch. This is amazing.

Thanks. Yes, it maintains the settings and remembers the remaining capacity. One thing I just realized though is that without power, it will not monitor the current when the batteries are charging. So I will have to remember to turn the key to the 'on' position when charging. So maybe you should...

Just finished my conversion! Everything seems to be working fine, but it's raining a lot here in the NE so I haven't actually mowed yet. But I tested it in the garage briefly. I installed the battery monitor and connected its power wire to the switched terminal in the ignition switch, so that...

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Hi @FilterGuy, I've been following your Top-Balancing write up (so well written, by the way!). I've been doing it with a CV/CC PSU that unfortunately only reaches 3A max. I first had them in series with BMS and finished off in parallel as you suggested. I set my voltage to 3.6V and eventually...

Yeah that's the same charger from my link above. My concern is that at 19A, I'm not sure if I would want to to rig it to plug into the Ryobi charger port, since that is all 14AWG and designed for the 13A Delta charger. So then an alternative could be to wire it into an Anderson-style plug that...