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Contact Jimmy for a quote for recell, he will reuse your case and bms. He is in North London. He will increase your 11ah anywhere up to 17.4ah esp if your battery only has 2200mah cells and for about 2/3's the cost of a new one.

Yes. SLA's are generally for instant amp draw high load rather then continuos use higher drain. Best DIY spot welders are mini hand size Arduino ones cost about 130 euros plus a power source either high drain lipo for power supply so anther £50 - £60 or a very high amp rated sla. Not cheap...

This the same people listing on Ebay. This one is only 6ah but uses Samsung 30Q 15a cells. compared to your present battery arrangement the weight will only be about 10% of the weight with much better performance the softpack will be about 1.2kg in total. A simple 2a charger will be needed with...

For a li-on battery you don't need a hard case battery as you place your SLA's in a compartment/box so for a bit cheaper you can use li-on soft packs. To ideally marry up a battery pack for you use we need to know the typical mileage and controller amp rating. Generally though any very good cell...

What you see is voltage collapsing/sag, the batteries can not deliver the amp load asked of it.

Another KT dual voltage 9 fet s/w this one with Julets. https://www.aliexpress.com/item/36V-48V22A-Electric-bicycle-standard-sinewave-controller-Light-function-water-tightness-cable-KT-Series-500W-conversion/32857864688.html?spm=a2g0s.8937460.0.0.816c2e0eclx0Ko

48v 13s will have a max charge of 54.6v, 54v is 4.15v per cell which is fine if all the 13 groups are in balance. The fault is more likely as Dave has said so carry out his tests as in #2.

Charging at max voltage level isn't very harmful if you are using the bike say with in 6 -12 hrs of charging, the harm is really done when peeps use their bike then fully charge it before putting it a way for a week or four. Leaving it fully charged is like putting a bull in a China shop, in the...

Have a look at post #4 bottom rh corner, click on 'show all' and your name comes up against the 'offensive language' emcion.

At 3a and above the GA holds slightly higher voltage so will have a little more pep to it. If planning on using the full 18a of the TSDZ opt for the GA for less sag or use more cells in parallel.

1. Most likely will either be throttle or speed sensor plug it in and see. Easiest option to disable Pas is disconnect it or or increase the air gap between sensor and magnet disc located on the bottom bracket.

Only legal if 250w rated, AFAIK Xiongda's are 350w. If using a 48v battery buy 48v hub motor. The only reason us guys over volt a 36v hub is because we already have it, there is a chance risk of frying the hub or melting the nylon gears but only if you go mad with the amps.

I had four li- po graphenes which were being under used so I soldered them in to 10s pairs with a bms, with all the required wire mods then added a switched bms, I now treated them more like my li-on's with less faff charging/discharging. Today I paralleled them and a 14.5ah li-on together and...

On a 36v li -on battery 10% for each volt decrease between 42 - 32v isn't prexact .

This one says it is 9fet 25a KT sinewave model & dual voltage, it certainly has a 6 wire hall block using the std DJ7061 connector. https://www.ebay.co.uk/itm/Ebike-Brushless-Controller-36V-48v-500W-9-Mosfet-KT-Sine-Wave-Controller/253946414941?hash=item3b2062c75d:g:9pMAAOSwI9FcF1Fo:rk:27:pf:0...

Charging too low can/will bring issues, though is up to you to manage and be happy with your process. Under charging looses quite a bit of capacity/range also the pep/power generated esp under PAS use. On my bikes I certainly notice the difference with power when voltage is decreasing...

If you had 4ah remaining and it was 10% as you say your battery would have to have original capacity of 40ah so you math is out. For real world usable li-on capacity use 3.2v - 4.2v as the fuel tank and very roughly use each 1v decrease as 10% capacity usage. Typically at your 36.2v you would...

If pics listed with said controllers are of the actual controller sine wave (sensored ) ones can be defined by having hall wires present.

4.12v is a an arbitrary choice which I use but do carry out a full balance charge every half dozen rides. A little top end capacity is lost but in my view not a lot about <5%. typically when fully charged I see the top end voltage in use disappears very quickly down to about 4.12 and the max...

Double check the motor connector is in all the way.