Battery probs / charging system

[bollo]

so i bought a new lithium battery to save some weight well 2 batteries later on the race track 3 laps in it burnt itself out http://www.braillebattery.com/index.php ... teries/g5l anybody else ever had an issue ?
i was told that because Honda rates the charging system as 15.5V @ 6 amps they said thats to high for a lithium battery yet when i took my old lead cell battery in to show what i had they sold me what they tole me was a direct swap out

[magg]

Have you measured the charging voltage on your bike, a faulty rect/reg will damage a battery no matter what type it is.

Charging voltage should not exceed 15 volts at any rpm.

[Neosophist]

I have friends runnign lithium batteries on their nc30 withotu trouble.

as magg said test the charging system.. if the reg/rec has failed it can output too much voltage.. this will kill all batteries but I would imagine a Li-Ion battery will die quicker.

[Morespeedvicar]

Your lipo battery will have a a nominal voltage of 14.8v and bikes have a charge voltage of 14v volts (ish) so they should be fine, but if your going to test your charging system you'll be better off trying it with a lead acid battery otherwise your voltage reading will be high with the lipo battery.
Lipo batteries need balanced charging and are not supposed to be charged like lead acid batteries you have to monitor each cell and make sure it doesnt go over 4.3volts (tho i've had them to 4.7 but get a bit toasty!!) otherwise the cell will die!
Even Boeing have lipo batteries problem in the 777 thats what was catching on fire when charging, in the radio control world lipo batteries are supposed to be kept/charged in fire proof bags just incase.

Cheers
Ian

[magg]

Not sure how you are going to monitor each cell voltage, as terminal of each cell are not accessible on the battery at the link page. Type of battery should not affect charging voltage, charging voltage is set by the rect/reg.

Everyone flogging lipo batteries for motorcycles will tell you they are fully compatible with OEM lead acid types (this statement does not necessarily represent the view of this forum member).

[bollo]

Honda show it at 15.5 v @ 5000 rpm this is what happened to my new lithium battery

[Neosophist]

Honda show it at 15.5 v @ 5000 rpm this is what happened to my new lithium battery

Honda show it as a range 13.5-15.5v? and its hardly to never above 14v.

Even with a new reg/rec directly wired to the battery your lucky to see much over 14v, although i do seem to recally my friend with the LiIon battery has a slightly higher charge rate.. perhaps to do with the battireies interal workings but his voltmeter shows 14.9v with the li-io batt.

In my local chain bike shop there are many li-ion batteries listed as being compatible with the NC30, indeed I believe its where my friend bought his from over 1 year ago now.

It seems very suspicious that your manufactureres battery supposidly isnt compaitble.

That battery website seems a bit crappy, i cant find any specs, but I did manage to find.

"Maximum recharge Voltage: 14.8 - 15.2 volts" only slightly under the theoretical maximum of the nc30. I cant see your bike failing so badly without some serious over-voltage goign on.


Have you checked the charging output yet?

Once your bike is verified ok then Charging off the bike with these batteries is a different issue

Most if not all lithium ion motorcycle batteries come with fancy charging stuff built into them so that you can just connect them upto a motorcycle battery and let the inbuilt electronics handle the charging.

I've also seen some come with a multi-pin ribbon cable that you can connect to a special charger to perform exteneded tests / balancing of the cells / rapid charging.

You need to read the individual bike batteries instructions very carfully.. many cannot be charged with normal wall outlet chargers and trickle chargers but the motorbike itself is ok to charge it.