Best lithium battery chemistry for a DPV?

[Jon Nellis]

OK but is it going to last longer than a lead battery or is it just a waist of money im looking for more burn time.
Cheers Darrell

To simplify what Tobin said...

In a scooter at normal cruise power, the 25Ah LiFe will yield similar runtimes to a 40Ah SLA, because you will not actually get 40Ah out of the SLA battery at higher current loads.

The electro-chemical conversion efficiency of SLA decreases significantly as the current load increases. If you were to discharge a 40Ah SLA battery at 40 amps, you would likely get about 20Ah out of it.

From Alternative Energy eMagazine - A Comparison of Lead Acid to Lithium-ion in Stationary Storage Applications | AltEnergyMag

Hope that helps,
Jon

 

[dspe]

OK then if i understand right a SLA 25amp will last the same time at cruse speed as a litium 25 amp but at full the litium will last longer?I know i am a bit slow,i just would like to get it right with out waisting loads of money for nothing!
Cheers Darrell

 

[cool_hardware52]

OK then if i understand right a SLA 25amp will last the same time at cruse speed as a litium 25 amp but at full the litium will last longer?I know i am a bit slow,i just would like to get it right with out waisting loads of money for nothing!
Cheers Darrell

Apparently I failed completely in trying to explain the difference in how amphours are determined for SLA vs Li-Ion. Sorry, don't know what more I can add......

Tobin

 

[andrewy]

We had good outcomes with PIng batteries i.e. 40AH lifepo4 briks. they work nice.. only fit in gavins though. i also experiment with 18650 liio panasonic made and proper BMSs. easy to build and fit into smaller scooters. i currently have N 19 outfitted with 35AH LIIO pack. 14P 7 S configuration. agsin most important is to find matching BMS and charger.. therefore read specs for cells first and make sure everything matches on low/hig cutoffs and discharge rates. Dspe , yes kinda, SLA wil give the rated energy , but much slower and at lower rate , perhaps too low to be practical. If you u run it at higher load capacity goes down (hence always burn test em, i use 1.3 ohm resistor), LIio on another hand can serve the rated capacity at higher discharge rates.

 

[AJMcc]

After some research and talking to a few battery makers overseas including Ping, who was most helpful. I will most likely be going with Headway cylindrical cells, 40152S 15Ah
in a 3P8S configuration giving me a 45 Ah battery.
That's the plan for now anyway.


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