Can you use 72v Charger to charge 96v of sla?

[egromftw]

In other electronics going lower is usually safe (just sower orbtrickle charge) but over is often detrimental but ebikes are new to me. Can I use a temprarily a 72v charger to chathe 96v of sla?

 

[amberwolf]

If the 72v charger is for a 20s lithium battery, then it's output is only 84v or so.

If the 96v of SLA is 8 x 12v batteries in series, then it's minimum voltage to charge them up just to "completely dead" is more than that.

So...no, it won't help.

You'd need a charger of about 8 x 13.6v (or higher depending on what the SLA say on the battery labels for charging requirements), which is 108.8v, if you actually want to charge them "full".

 

[john61ct]

And for decent lifespan, you really do want to get to 100% Full, as quickly and often as possible.

LI chemistries are happier sitting at less than Full, but not lead.

 

[egromftw]

If the 72v charger is for a 20s lithium battery, then it's output is only 84v or so.

If the 96v of SLA is 8 x 12v batteries in series, then it's minimum voltage to charge them up just to "completely dead" is more than that.

So...no, it won't help.

You'd need a charger of about 8 x 13.6v (or higher depending on what the SLA say on the battery labels for charging requirements), which is 108.8v, if you actually want to charge them "full".

If its max output is 84v can I get away with just adding 1 battery to the series using stock charger? The bike in question is the Boom E Vader aka Egrom

 

[amberwolf]

If its max output is 84v can I get away with just adding 1 battery to the series using stock charger?

No, if you add another battery then instead of 8 it's now 9 times, so the problem is even worse.

You would have to get a higher voltage *charger*, not make a higher voltage *battery*.

 

[egromftw]

If its max output is 84v can I get away with just adding 1 battery to the series using stock charger?

No, if you add another battery then instead of 8 it's now 9 times, so the problem is even worse.

You would have to get a higher voltage *charger*, not make a higher voltage *battery*.

Oh no thats not what I mean. The stock set up is 72v I want to add 2 batteries to make it 96v based on recommendations for overvolting the stick parts can handle that much before needing an upgrade on parts. You mentioned the charger is likely outputting a max of 84v. I was wondering if that is true then would adding a single battery (going from 72v to 84v) be fine without upgrading the charger.

 

[amberwolf]

Oh no thats not what I mean. The stock set up is 72v I want to add 2 batteries to make it 96v

Well, none of your posts said anything about that.

So:

You mentioned the charger is likely outputting a max of 84v. I was wondering if that is true then would adding a single battery (going from 72v to 84v) be fine without upgrading the charger.

As I said originally, if the charger is for a Lithium 72v battery it would output 84v.

If this is your original SLA 72v charger, then it would probably output about 13.6v x 6 batteries in series, which is only about 82v.

You would have to check what it actually is, in either case.


A 7-battery SLA pack is 7 * 13.6v when full, which is 95.2v.

82v / 7 is only about 11.7v per SLA, which is basically dead.

So a charger that outputs only 82v will still not charge it.

As I said before, you will need a higher votlage charger to charge a higher voltage pack.

 

[john61ct]

IOW changing the pack voltage, or the chemistry, usually requires buying a new charger.

Unless you have a very adjustable one like Grin Satiator's highest voltage unit.

 

[egromftw]

Oh no thats not what I mean. The stock set up is 72v I want to add 2 batteries to make it 96v

Well, none of your posts said anything about that.

So:

You mentioned the charger is likely outputting a max of 84v. I was wondering if that is true then would adding a single battery (going from 72v to 84v) be fine without upgrading the charger.

As I said originally, if the charger is for a Lithium 72v battery it would output 84v.

If this is your original SLA 72v charger, then it would probably output about 13.6v x 6 batteries in series, which is only about 82v.

You would have to check what it actually is, in either case.


A 7-battery SLA pack is 7 * 13.6v when full, which is 95.2v.

82v / 7 is only about 11.7v per SLA, which is basically dead.

So a charger that outputs only 82v will still not charge it.

As I said before, you will need a higher votlage charger to charge a higher voltage pack.

Lol yea I should have lead with that Im sorry. Thank younfor all your help and to everyone else who replied.