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Gordon Gray, kevin, NickL
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Original Post (Thread Starter)
#891095 09/19/2022 2:50 AM
by Paul Sammut
Paul Sammut
This topic is bound to have been discussed before, but when I’ve used the same words in a search, I get 20,000 returns, none of which include my wished-for topic, so here goes:
Can anyone using such a battery in their classic bike please tell me if they have had to modify their charging system to achieve appropriate output for a lithium battery?
Thanks in advance,
Liked Replies
#891166 Sep 19th a 06:33 PM
by edunham
edunham
I have had a Shorai in my 71 Trident for 6-7 years now without problems. It has the original charging system but for a Podtronics unit. I also have one in my BSA Spitfire and my Velocette with a 12 volt conversion. Same story. On the other hand my Bsa unit singles killed them and one exploded in my '68 Suzuki. I could never get the Shorai charger to work very well. A regular battery tender (not a smart one) has worked fine for me, though.

Ed from NJ
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#891586 Sep 23rd a 05:34 PM
by Mark Z
Mark Z
Lithium batteries have a different "finish voltage" from wet lead-acid or AGM batteries. This affects at what point an automatic battery charger or tender will "shut off" (i.e., stop charging). This is typically not an issue for on-board charging systems, as the battery is always being discharged at the same time it's being charged.

The danger of fire from lithium batteries arises from a rapid discharge. Most if not all large lithium batteries have a built-in regulator, so they cannot discharge too rapidly if, for instance, the battery is connected to an appliance that draws a lot of current, like impelling an electric motor from a standing start. A direct short, however, will overcome the regulator and cause the battery to catch on fire. Likewise a faulty regulator may cause the battery to catch on fire.
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#891654 Sep 24th a 10:39 AM
by DMadigan
DMadigan
LiPo batteries need a balanced charger with wires from each cell to monitor the voltage. These are the type that are used in drones and model airplanes that should be kept in a fire proof container when charging.
LiFePO4 are used in motor vehicles and do not need the balanced charger. This is the type that I bought for the Wenco racer to replace the 4 AHr lead-acid after adding the electric starter. Only tested starting so far, not running on the road.
Even a single phase generator will work. The battery only has to provide power for starting. The capacitor batteryless replacement system with points works with single phase.
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