When I brought the batteries in to recharge, one of the batteries went through the recharge cycle successfully. Then I put the other battery on the charger, but it indicated that the battery was fully charged and did not even start up.
Is this normal, that one battery can require recharge while the other is still fully charged? And why does the snow thrower perform with less power? It throws snow only about 1/3 to 1/2 as far as it did last year during my first two uses.
Try running the snowblower with one battery and see if it works with a battery in either compartment. If it doesn’t work with one battery in one of the two sides, and with equal power, you may have found the issue.
_ When I brought the batteries inside to recharge, battery "A" went through the recharge cycle as expected;
_ Battery "B", however, demonstrated the same properties as previously. The charger hiccuped a startup noise, the battery light flashed from red to green and the charger showed all green lights (fully charged) and was not running.
_ It appears that my machine is only using one battery at a time.
_ Could it be a battery flaw or a power distribution problem in the machine works?
_ Yes Jacob; using 2 5ah batteries that came with the snow thrower.
_ I will record how the batteries are used (battery and bay combinations) the next couple of times that I have to clear the driveway. No snowfall since two days ago.
_ Thank you all for the logical steps for investigating this problem. Hopefully it will reveal something tangible for warranty consideration.
He gave me the procedure that he wants me to follow to determine if the problem is in the battery or in the snow thrower itself. Here is the outline:
1. Insert the batteries into both bays. Note which battery is in which bay.
2. Run the snow thrower until a battery shows that it is exhausted. (Red Light).
3. Put each battery on the recharger and fully charge each battery.
4. Note/Mark the battery that did not require recharging or required very little recharging.
5. Re-insert the fully recharged batteries into bays opposite to which they initially occupied.
6. Repeat steps 2. to 4. above.
7. Note if a) the same batteries stayed charged and discharged, or
b) battery charge behavior has changed and how.
This outline is in my own words, so it is not the tech's fault if I goofed it up.
I will do this and hopefully the warranty process goes through smoothly.
Any comments? points to highlight? etc.?
The batteries arrived about 15 days later (I'm in Canada) and I thought that I should make sure they are fully charged. I unpackaged both from their plastic blisters and began charging. The first battery was on the charger for over an hour and there was no indication that it had charged any at all. The charger's first green light was blinking, but the battery light was dead (no activity at all, on or off the charger). This battery was DEAD right from the package. The second battery charged fine - no problems.
I sent EGO an email about the DEAD battery they sent me, That was back in January 23, 2018. They sent me an email indicating that they are opening a case number on this matter (automatically generated, I am incllined to think), and I have not heard from them since then regarding this matter. So it appears that either they are very busy with various problems to respond to or else something is poorly organized with customer service. They seem nice enough but no solid results yet.
I have started a log to see if I can isolate which one of the old batteries is not working properly. As I indicated before, the problem does not repeat in a consistent manner. In my opinion, the problem may be in the machine circuitry, or one of the batteries, or possibly a combination of certain conditions, along with a particular battery and the machine circuitry that may cause this intermittent problem to occur.
So far it does not appear to be a charger problem. I am not an expert in this area. Maybe someone has experience or knowledge that may help.
A quick note on this. I also noticed that the batteries do not discharge equally on my show blower. I have a fair length of driveway and sidewalk to clean and we had a fair amount of snow this weekend. At some point, I noticed that one of the battery flashed red, while the snow blower was still at heavy work, while the other one remained green for quite a while longer. They ended up both depleted (both flashing red), but at a quite significant different time.
My thoughts on why this is happening (all speculations and food for thoughts...):
1- Maybe both pack were not 100% full to start with, or more precisely, the “Full” state was not interpreted the same on each battery. As all chargers, I am quite sure the EGO one stops charging when it detects a delta V smaller then “x” (I do not know the exact value, but should be fairly small). This delta V might not be detected at the exact same point for several reasons and since the pack has a fair amount of cells (I have 2x7.5A batteries), it may end up that some cells on the pack which depleted faster were not at full capacity, impacting the “full” Wh to a noticeable level.
2- The cut off (snow blower BCM?) detecting the remaining 20% capacity (just guessing on the %, I don’t know exactly how deep EGO has set the safety to prevent cells damage, I just know nobody set s it to 0% for Li-ion cells...) has hit a weaker cell and triggered it to be deemed empty before the other pack.
In any case, if one of the two use case above is exact, it means there might be a weaker cell (full SoC or empty SoC) in the pack which lead to “detecting a depletion” faster than the other pack. It does not mean a defective cell yet, but can indicate a weaker cell, still within the capacity boundaries agreed upon in one of the too lengthy agreements we probably signed when purchasing the product without paying too much attention to it...
My other thought was that the snow blower does not draw equally from both battery at the same time/same level and can still work at peak torque (motor at full 2000W) from only one battery, which could be bad. This could happen if the “battery availability detection” process is made out of having two batteries locked in the bays, not on analysis of available capacity in each pack. Even if one is fully depleted, the snow blower could not “know” (it just knows there is a pack in there) it and just asks more from the healthy one. If it is the case though, it means the load on the healthy pack is 35.7A (assuming 56V for a 2000W motor). Are there cells able to handle this kind of load today...?? This kind of load could damage a cell quite rapidly. Time will tell...Long story short, I did experience the same behavior as the OP. Just don’t know why yet... and not too worried about it... yet...