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This post has been edited by alexei: Oct 3 2025, 09:01 PM

So my 12v voltmeter arrived and I tested the battery.

Bike off: 12.7
Engine idling: 13.8 ~ 14.2

Bike also started without issue after a full day of idling... strange.

I will monitor further and try to hold off the mechanic visit until it's December, when it's time to do my oil change and minor service, and have everything done altogether.

The little battery voltmeter I got was quite handy, small enough to fit right under the rear passenger seat compartment. It's the ANENG BT-171 for anyone interested.

the readings are good
but, for bikes, you gotta rev til 4~5k to get the actual reading

readings look normal.


Just check the voltage when you crank it. If it drops a lot it will indicating a weak battery. I still prefer a normal fast responding multimeter for this through.

Even if you have full voltage on the battery, an older battery might not give you enough amps to start the bike.

My garbage green tokiohama battery reads full but refuses to crank the bike after a few days of sitting. Im using a yuasa battery now and it cranks fine even after 2-3 weeks of sitting.


Also monitor the readings when riding. Sometimes a flaky rectifier might stop charging when it gets too hot.

This post has been edited by jaycee1: Oct 3 2025, 10:45 AM

another vote on yuasa.
my yuasa ytx14 is now 1.5 year old and still gives >300A CCA (it's rated at 200CCA).


i always tender charge/trickle charge the battery if i don't start the bike more than a week.
heck i always try to charge and keep it full weekly since lead acid don't like the charge to go <40%

using this imax multitype charger that i use for everything.

I installed this 2-way USB charger and use it to charger / tender my battery with a power bank.

Scooter with plenty difficult to remove fairing is pain for DIY therefore gone for this solution.

Is this connected directly to the battery (not switched off when the bike is off)?

https://www.serdangmotorcycle.com/product/k...splay-waterpoof

Yes. Had to connect direct to battery, and the ACC line.

When ACC is off, it will charge the bike's battery.

When ACC is on, it will provide power to your equipment via the USB port.

I found my Android phone charging the bike's battery when I first plug it in with ACC off

I bought from Taobao.
Also available on Aliexpress:

https://www.aliexpress.com/item/10050083314..._origin_prod%3A

thanks

I copied the link to show the wiring diagram, and did not check it was the correct link
there's a module, and uses ACC power to switch between modes, so it protects the battery

Correct about the ACC which is the main reason I pick this one over the more expensive Chigee brand.

Chigee brand pushing out high price items trying to be Xiaomi of motorbike accessories, but I found them to be overly marketed to push price up.

The two way charger of Chigee uses auto volt sensing and not the sure fire ACC to control the direction of charging.

Ini B6 barang sure kaki RC nihhhh.... heheh... every drone builder I know has one of these.

I also dumped the original Yuasa YTZ12s for the slightly bigger, cheaper Yuasa YTX14s. Asalkan muat bawah seat, aku sumbat je.

This post has been edited by ZZR-Pilot: Oct 21 2025, 05:07 PM

used to build drone. big drone.

can't find something better, and more cost effective than the B6. so still using it, can charge everything that i have.

Ini agricultural drone nih. I only built FPV drones pakai Betaflight je, just for shits & giggles. I'm out of it edy, between work & studies I got no time left for hobbies.

This post has been edited by ZZR-Pilot: Oct 21 2025, 05:24 PM

Just an update on my Dynavolt LFP battery. Started to see some voltage drop on start up. Still cranks good. Let's see how much longer this lasts. It's been like what? Only 6 months?

The NK seems to eat battery. No one can get batteries to last over 2 years. Too much active always on electronics I think.

Thanks for the input.

Was pondering if LFP can last longer than normal. Seems like same same.

that's the lithium ion? dafuq...