tabeth
1 µW
Hi all, long time lurker.
TLDR: I want to add a second battery to my VE1 Pro, is the safest way to connect in parallel, even if I plan on bringing in the “external” battery inside to work and charging that?
I have a ton of extra batteries as a result of having e-bikes, e-scooters and lawn equipment (I have too many Hart 6Ah 40V batteries). In particular I’d like to use a 48V 13Ah silverfish battery that I normally use for an ebike with the VE1 Pro. Though the VE1 Pro’s range is enough to go to work (one-way), due to work rules I cannot bring the scooter in, and I want to make sure that I have a full battery leaving and coming back to mitigate range anxiety.
From reading this forum over the years, there seem to be a few ways to do this:
1. Since both batteries (the internal VE1 Pro battery and the external silverfish battery) are the same voltage, I can just connect them in parallel and call it a day. I would do this, but I’m concerned on what would happen if I brought the external battery inside to charge it and then reconnected it. My view is that initially both batteries are at 100%, and thus around 48V. After my commute, both might be say, 75% and still 48V. If I charge the external battery, Then the internal battery might be 75% and the external 100%. After returning home the internal might be 50% and the external 75%, I imagine this could result in slight voltage differences that would be bad, no? Also curious what would happen if I never charged the internal battery and only charged the external.
2. I could just disconnect the internal battery, and connect the internal XT60 connector solely to this external battery. This is the simplest thing, but I’d prefer not to do this, since the battery is glued in the scooter (though I could use a hair dryer and remove it I’m sure) and it might as well be used if I’m hauling the weight.
3. I could get one of those marine battery toggle relays, where I could switch between the batteries. This seems promising, but I’m not sure if these relays are waterproof.
4. I could connect the batteries in parallel and have two toggles to achieve something similar to (3). Same issue with the waterproofing, though.
There might be more options.
TLDR: I want to add a second battery to my VE1 Pro, is the safest way to connect in parallel, even if I plan on bringing in the “external” battery inside to work and charging that?
I have a ton of extra batteries as a result of having e-bikes, e-scooters and lawn equipment (I have too many Hart 6Ah 40V batteries). In particular I’d like to use a 48V 13Ah silverfish battery that I normally use for an ebike with the VE1 Pro. Though the VE1 Pro’s range is enough to go to work (one-way), due to work rules I cannot bring the scooter in, and I want to make sure that I have a full battery leaving and coming back to mitigate range anxiety.
From reading this forum over the years, there seem to be a few ways to do this:
1. Since both batteries (the internal VE1 Pro battery and the external silverfish battery) are the same voltage, I can just connect them in parallel and call it a day. I would do this, but I’m concerned on what would happen if I brought the external battery inside to charge it and then reconnected it. My view is that initially both batteries are at 100%, and thus around 48V. After my commute, both might be say, 75% and still 48V. If I charge the external battery, Then the internal battery might be 75% and the external 100%. After returning home the internal might be 50% and the external 75%, I imagine this could result in slight voltage differences that would be bad, no? Also curious what would happen if I never charged the internal battery and only charged the external.
2. I could just disconnect the internal battery, and connect the internal XT60 connector solely to this external battery. This is the simplest thing, but I’d prefer not to do this, since the battery is glued in the scooter (though I could use a hair dryer and remove it I’m sure) and it might as well be used if I’m hauling the weight.
3. I could get one of those marine battery toggle relays, where I could switch between the batteries. This seems promising, but I’m not sure if these relays are waterproof.
4. I could connect the batteries in parallel and have two toggles to achieve something similar to (3). Same issue with the waterproofing, though.
There might be more options.
