Can The 28 Ah Commercial Backpack Battery (BAX1501) Be Used With Handheld Tool Chargers?

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I am considering pairing the 28 Ah Backpack Battery (BAX1501) with the non-commercial series of Ego's handheld tools via the Battery Backpack Adaptor (ADB1000). However, the designated commercial-series charger (CHX5500) intended for use with the 28 Ah commercial-series backpack battery (BAX1501) is not included in the $1,300 list price for the backpack battery, and retails separately for $199.99 at Home Depot.

YouTuber Copper Creek Cuts uploaded a thorough — albeit critical — series of video reviews of the Ego commercial series lineup during extensive field testing. In the specific video linked below, he demonstrates how the 28 Ah commercial backpack battery can be charged using a standard charger via use of the ADB1000 adaptor:

While it's likely that the standard or even rapid chargers included with the various Ego handheld tool kits would charge BAX1501 much slower than the advertised 210 minutes of the designated CHX5500 charger, it would appear this route would at least be possible. After all, the product listings for both the standard and rapid chargers for handheld tools on the Ego website specifically state that they "charge all EGO POWER+ Batteries".

However, the standard and rapid-series charger specs as listed in the product manuals do not list the BAX1501 as being compatible, while the specs for the commercial-series charger appears to indicate that it is not backwards-compatible with the smaller individual batteries. Take a look at the below Product Manual excerpts:

56V Standard Charger (CH2100)

56V Rapid Charger (CH5500)

56V Commercial-Series Charger (CHX5500)

Last but not least is the Ego Support Team's response to the below question regarding the BAX1501 backpack battery charging capabilities:

With all of the above in mind, what is the consensus? Can the BAX1501 backpack battery be charged safely and without damage from the standard/rapid chargers included with handheld tools (CH2100/CH5500) via use of the ADB1000 Adaptor?

Conversely, can the CHX5500 be used in combination with the backpack cord and ADB1000 adaptor to charge individual 2.0/2.5/4.0/5.0/7.5 Ah batteries?
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Posted 3 months ago

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I think because the the ADB1000 adapter allows for a connection, you can plug the BAX1501 into a standard or rapid charger.  And as a connection is made the lights will go on as seen in the video.  It may even charger the BAX1501 some. 

But as the standard and rapid chargers are not designed to charge the BAX1501 they will not charge it properly and could result in damage.  Remember there is more going on than a transfer of power.  The charger regulates the flow of power and determines when the battery is fully charged , needs cooling, etc. 

So can you plug them together via the ADB1000 - yes
Will it charge - maybe
Will it charge properly and safely - no
Is it designed to be used together in that manner - no

The ADB1000 is designed as a one way adapter - Bax1501 to tool

I would think the same answer applies to the CHX5500 being used to charge a standard battery.  You may get a connection and some power flow, but they are not designed to be used in that combination and could damage the batteries.