EcoFlow Extra DIY Battery

Phil1

Phil1

Member
T6 Pro
Hi all, I’ve finally purchased an EcoFlow Delta 2 battery for my van. I’ve got a Halfords Compressor Fridge 32l. I’ve done a quick test and it runs the fridge for approx 48hours.

I was hoping to get slightly more and use it for other things such as a small electric grill. Obviously a mistake on my part with expectations! I’ve since bought the 800w EcoFlow alternator charger as we will more than likely pop out whilst camping, this should top it up and hopefully get us a long weekend.

However….I’m now intrigued and have been researching the extra battery option to increase capacity without spending too much £££.

I was thinking of buying a small 12v 20ah battery to top the EF up with (and as a backup). Then watched a video of someone who used 18v power tool batteries….then it clicked that I have a 48v 15ah (720wh) battery in the garage with a xt60 connector which is for my e-bike.

I’ve plugged it in and to my surprise started charging the EF with 386w input.

My question….is this a safe and workable solution to use? Obviously the EF and alternator method will likely cover my basics, I’d just like to know I have a backup.

Thanks in advance.
 
Just to add, I’m a complete novice with electrics (which is why I kept it simple with getting the EcoFlow rather than a built in system). I’m still learning all the terminology of it all! Thanks
 
Cant help buddy. me and electric are not best mates, but this is interesting as I have an EcoFlow Delta 2 and am looking at cheap options to expand the capacity. Great question.
 
Fingers crossed it works, so far so good. I just need to know it’s a safe option without causing damage. If it works, then it will be ideal for me as the e-bike battery is around a 3rd the physical size of the EF, so can easily be kept in the van and adds a pretty decent capacity upgrade.

If i didn’t have this, I’d be looking at the power tool battery option, as I’ve got a few 5ah dewalt batteries I could use.

If you find any other ways, let me know 👍🏻
 
As long as you aren't stressing the bike battery beyond it's design spec, then I can't see a problem.
 
I would be very careful unless you’re really confident you know what you’re doing- I’ve seen too many videos of these batteries going up in flames big time.
 
Hi all, I’ll try and find the videos however they were for the power tool option. I’ve only thought of the e-bike method as it has the correct connector already on, I’m not confident enough to start messing with internal stuff and re-wiring!

This battery is used for running my 750w e-bike motor (35+ mph), so I’m hoping in comparison this should be ok?

The power did drop to around 200w input and then stopped when the EF hit 100%.

In other news, the alternator charger has just arrived and feels very well built and heavy duty. I’ll get it connected asap. I’m guessing this will only charge the EF and the bike battery will only act as one way?
 
So you need to butcher the charger cable by cutting the plug off and fitting the relevant connector?
 
Sorry, I'm confused. Your bike battery has that lead attached ?
My bike batteries are both Bosch and don't have a lead as such but internal connector to the bike
 
Yes, sorry I probably should have mentioned it’s not an off the shelf e-bike. It’s a converted standard bike with a mid drive bafang motor.
 
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