# Thread: ZX-1 Power Add-on owners thread

1. >128Wh/12V=10.66Ah was my logic which I think is right.
I agree with your math, but...

>spec sheet states Lithium Ah=10
These could be 10.66Ah, but it is not common to rate LifeP04 cell sets in that amperage. 10Ah is normal.

> lead/acid equivalent Ah, 24-35Ah which is 2.4-3.5x10"lithium" Ah
So you think they are saying one of their lith batteries is as good as 2.4 to 3.5 sla's? I guess that is the question we are grappling with.

>Do you see a voltage drop soon enough to know you aren't past half full? IE: before it's too late to turn around!
No, it runs the same. I do notice a full charge, 29.4v and get used to the pep quickly. When I run out of steam the chair starts to act up a little about 15 seconds before cutting out. I've made the mistake of letting the battery rest a bit and turning it back on to get a little further along. Not so smart, the practice can damage the battery.

2. ">Do you see a voltage drop soon enough to know you aren't past half full? IE: before it's too late to turn around!
No, it runs the same. I do notice a full charge, 29.4v and get used to the pep quickly. When I run out of steam the chair starts to act up a little about 15 seconds before cutting out. I've made the mistake of letting the battery rest a bit and turning it back on to get a little further along. Not so smart, the practice can damage the battery."

This implies the need for a "consumption meter". Basically computing watts (AxV) over time so the user knows reasonably closely how much capacity has been used (Wh)

3. Originally Posted by pfcs49;1879412[COLOR=#333333

This implies the need for a "consumption meter". Basically computing watts (AxV) over time so the user knows reasonably closely how much capacity has been used (Wh) [/COLOR]
A recommendation from a member (power pod) here was this: https://www.youtube.com/watch?v=F-idUaalx24 I put one on my trike, but never used any readout except volts. That battery never gave me any trouble. The video points out this meter clears it's memory when power is cut, so you'd have to keep a running total. I think static low voltage cutout is as good an indicator of battery condition. My problem with the I-Glide is that the battery does not have enough Watt hours. It is supposed to be the same battery that I bought to power the SmartDrive hack. I ran that over three miles, in fact I can't remember that hub motor ever sucking the battery dry like these brushed ones in the I-Glide do.

4. Originally Posted by pfcs49
...
spec sheet states Lithium Ah=10
lead/acid equivalent Ah, 24-35Ah which is 2.4-3.5x10"lithium" Ah...
I was surprised to find the ZX-1 user manual on line today. https://manualzz.com/doc/6883887/zx-1-user-manual So now I understand why you took to a 15Ah lithium, but not why the battery source place claims it needs a 100Ah like I thought. So I looked further like I should have to begin with and looked up the specs on an M300. It uses two 60Ah (120 total) batteries but weighs a staggering 345 lbs, not the 75 to 82 of the ZX-1. So the ZX-1 should not need nearly as much power as a full power chair. This is good news for me too, BTW and is the reason my interest has been sparked.

The online ZX-1 manual shows:
Lead: 12 volt, 15 Ah (2). AGM. 5 - hr. capacity = 12.75 ah.
Lithium: LiFePO4 12 volt 15 Ah

But what is better, it confirms what others have been saying for battery range:
5 miles Minimum w/ Lead and 9 miles Minimum with Lithium Batteries

5. I get way lessw than 5 miles with my one with SLA 2x12v15ah. I've never come close to running low with the one with Lithiums. No comparison at all.

6. Originally Posted by Patrick Madsen
I get way lessw than 5 miles with my one with SLA 2x12v15ah. I've never come close to running low with the one with Lithiums. No comparison at all.
agreed, i dont know why they dont just make all zx with lithiums. i cringe when a customer insists on regular batteries.

7. I am trending towards contacting whoever the distributor is (Spinergy?) and asking for the discount they offered at the Expo last year on the lithium conversion.
I can afford it, but I still operate out of the thrifty problem solver tech model I followed before retirement!
I bought my first new car in 06 and again in 16 (both GTIs) and found out that spending money is sometimes nice
WTF! In a week I'll be 72! Not taking it with me.

8. Originally Posted by pfcs49
I am trending towards contacting whoever the distributor is (Spinergy?) and asking for the discount they offered at the Expo last year on the lithium conversion.
I can afford it, but I still operate out of the thrifty problem solver tech model I followed before retirement!
I bought my first new car in 06 and again in 16 (both GTIs) and found out that spending money is sometimes nice
WTF! In a week I'll be 72! Not taking it with me.
Study the possible function of the Spinery ZX-1 BMS on page 43 of the User Manual https://manualzz.com/doc/6883887/zx-1-user-manual. It does not look to me to be protecting the two batteries from interferring with each other, and they should each have their own built in BMS for balancing individual battery cells. I forget the exact numbers, but each little cell has a high limit of something like 3.7v and an important cutoff low voltage of 2.2v. The battery BMS takes care of this. However the user manual states that the Spinergy BMS reserves power after low voltage cutoff for the clamshell operation. That can only mean it cuts off power *before* or at a higher voltage than is necessary. I'd quiz them.

9. Originally Posted by nonoise
Study the possible function of the Spinery ZX-1 BMS on page 43 of the User Manual https://manualzz.com/doc/6883887/zx-1-user-manual. It does not look to me to be protecting the two batteries from interferring with each other, and they should each have their own built in BMS for balancing individual battery cells. I forget the exact numbers, but each little cell has a high limit of something like 3.7v and an important cutoff low voltage of 2.2v. The battery BMS takes care of this. However the user manual states that the Spinergy BMS reserves power after low voltage cutoff for the clamshell operation. That can only mean it cuts off power *before* or at a higher voltage than is necessary. I'd quiz them.
What's different from the Pb battery scheme is that it has a connection to the middle of the two batteries (@12V level)
Perhaps it somehow balances the charging? Looking for two 12V LiFePO to charge in series, I found some that stated you couldn't charge that way.
Probably this schema is a BMS for a pair of 12V packs to ensure that they are equally charged if their resistances differ.

PS: thanks for the link; I didn't have the manual!

10. Originally Posted by pfcs49
What's different from the Pb battery scheme is that it has a connection to the middle of the two batteries (@12V level)
Perhaps it somehow balances the charging? Looking for two 12V LiFePO to charge in series, I found some that stated you couldn't charge that way.
Probably this schema is a BMS for a pair of 12V packs to ensure that they are equally charged if their resistances differ.

PS: thanks for the link; I didn't have the manual!
I do not understand how that BMS could balance the charging.

Look back at the user manual page 42. The Pb batteries are not isolated during charge. It may not matter at all with Pb since the charger will trickle down if one battery fills faster than the other.
But looking at page 43 I don't see how that BMS could monitor the charge between batteries. And lithium chargers do not trickle down. So at full charge they cut off which might leave one battery weaker than the other. Combining batteries in series without a bms this way might be just fine. My original point was that you never said you found the Spinergy BMS on your ZX-1. I am questioning if it is necessary except to operate the clamshell.

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