Had it with Hobbyking products..

[amberwolf]

So expensive,and 1 bum cell screws everything...

With LiPo (or other chemistries) in most pack designs, 1 bum cell can usually be replaced with a bit of work.

With SLA, or FLA, 1 bum cell does actually tend to toast an entire battery (usually composed of 6 cells), as they are not normally serviceable or individually replaceable. It might be possible to drill thru the covers to short across the bad cell from plate to plate of the cells on either side, effectively bypassing it, but I have never tried this (considered it several times).


For me, I use whatever batteries I have available, and fix them as they fail, no matter what kind they are, if it's possible to do so. Cant' really afford to throw out anything that still works at all.

MY 72v SLA's cannot fail,my bikes a rocket and they're cheap to replace.

"Cannot fail"? I dunno; I've had SLAs fail on me during a ride, during charging, or even just sitting there unconnected. Same as I have had every other chemistry I've used (whether on bikes or on other devices).


I can't argue about reliability of RC LiPo, whcih appears to be what you are comparing SLA against at this time, as I have not used any of it.

But, I *can* say that good quality LiPo batteries designed for their application can be very reliable for a very long time, as that is commonly used in almost every portable device on the planet (most commonly in the LiCo chemistry, but more recently in LiMnNiCo (NMC)). The cheap stuff tends to have problems, but so do the cheap SLAs, especially when used on applications they weren't meant for (thin-plate types on high-power long-term loads, rather than the thick-plate and other types that are made for that purpose).

 

[Spacey]

$700 for the Lipo and $120 for the charger $30 for the cellog8

That got me 17.4Ah at 66volts of serious none sagging power that has lasted me over 300 cycles so far and still running stong. Thats 1,148 WH of power available. Charges in an hour and can take anything you can throw at it which is 2 to 3,000 watts.

This all fits nicely into my bike and if a cell goes bad it costs me $100 to replace one of the packs. The whole battery pack weighs 9kg and I think it should be good for 6 to 800 cycles the way I am using it.

Work out your useable Ah from your battery I.e divide by 2, multiply that by your average voltage whilst in use ....this includes the huge sag....and then tell us your Wh's and the weight of your pack. Then work out how that compares to 1,148Wh's at 9Kg.

No comparison.

 

[liveforphysics]

$700 for the Lipo and $120 for the charger $30 for the cellog8

That got me 17.4Ah at 66volts of serious none sagging power that has lasted me over 300 cycles so far and still running stong. Thats 1,148 WH of power available. Charges in an hour and can take anything you can throw at it which is 2 to 3,000 watts.

This all fits nicely into my bike and if a cell goes bad it costs me $100 to replace one of the packs. The whole battery pack weighs 9kg and I think it should be good for 6 to 800 cycles the way I am using it.

Work out your useable Ah from your battery I.e divide by 2, multiply that by your average voltage whilst in use ....this includes the huge sag....and then tell us your Wh's and the weight of your pack. Then work out how that compares to 1,148Wh's at 9Kg.

No comparison.

What you described above, is called, "doing it right."

It's a pretty damn nice setup when you do it right.

Every chemistry sucks and will plague you problems if you do it wrong, regardless of what you choose.

 

[SamTexas]

...Thats 1,148 WH of power available.
...
This all fits nicely into my bike...

Can you fit all that inside the triangle? If not, how much are you able to fit inside?

 

[Spacey]

I could fit exactly double this in my Greyborg frame. So much room in that frame. I did have it on my Cannondale Gemini but it was too exposed.

 

[Jason27]

Wow that's a pretty sweet bike.