Any reason not to use a 4s lipo to replace pb on track 675?

[G]

As per title.

4s has a higher peak voltage, so shouldn't be damaged by the charging circuit.

I believe the bike's electrics should handle it ok.

(I have various lipos around, but no lead acid batteries that will fit and am a bit broke.)

[sickpup]

If run as total loss fine, if not...

[G]

It won't be run as a total loss.

Happy to hear of any issues with it running with the charging circuits, but not entirely up on how it'll work on this bike.

[cb1rocket]

Will burst in to flames!
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[G]

Citation, please. </Rogerborg>

[Islander]

It's a remote controlled model forum but probably relevant/helpful:

https://www.rcgroups.com/forums/showthread.php?t=209187

[Aff]

I think you saw that "12v" Bike 4s LiPo I pulled apart in the other thread.

LiPo's dont like being charged with an unstable voltage and they dont like the heat.

Why not just run without the alternator and have a few battery packs to swap out?

Or you can get 4s BMS's very cheap, so I would probably just bung one of them on and see what happens.
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Current Bikes:Honda 929RR Fireblade, Honda CD200 Benly (Project), Stomp Z2 140
Electric Bike Project

[spikenipple]

Have a look at using a LiFePo4 battery instead of Li-Po.
They're much better suited to the charging conditions of a stock bike and as light as Li-Po, also there's very little danger of them blowing your bollocks off if it goes wrong.
You can drop one in as a direct replacement to an OEM battery.
Don't charge them using an Optimate or any charger with a desulfation cycle.
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C50 > GN250 > XJ600 > SV650S K7 > 2001 RSV Mille R > MT-09, XR400R > 2005 Fireblade (trackbike) + 2022 MT-09 + ZXR400 race bike

[Polarbear]

[G]

Ta. Would the charging circuit even kick in if the voltage is over the minimum?
As above, I've already got Lipos and am a a bit broke .
I have been using a 65-130c 4.25a 4s for jump starting, but haven't left it plugged in after the jump (also, have since managed to short contacts and melt one of the internal connectors.)

A normal lead acid charger may not replicate the same conditions as a bike.

If I was spending cash, would probably look to ultracapacitors as do fancy a capacitor jump-starter solution and to have a play with them generally (would like to have them in motorhome and just have lead acid purely as leisure batteries).

[spikenipple]

[kramdra]

[Aff]

Or just use a BMS board.
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Current Bikes:Honda 929RR Fireblade, Honda CD200 Benly (Project), Stomp Z2 140
Electric Bike Project

[G]

[G]

Realised I've got a spare battery in the 'race' scooter that'll fit - it's 45CCA rather than 85CCA, but that might be enough (though the trumpet one is a bit underspecced anyway it seems.)

Was thinking I could add a switchable lithium 'jump starter' in if needed - nab a relay/switch from the lorry or something if needed.

[Blue_SV650S]

4S lipo fully charged @4.2v per cell is is 16.8v.

Minimum voltage for a cell before damage is around 3.3v per cell.

3.3v*4 = 13.2v

More healthy (for a long life) low voltage is 3.7v per cell.

3.7v*4 = 14.8v

On the maths alone I think you are pushing your luck!
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The purpose of life is to fight maturity.

[G]

[Blue_SV650S]