...

**Found a RC Pack that has great potential for 24V systems and specifically for my eZips with the RMB battery packs.**

Floureon 7S 5000mah 25.9V 40C Lipo Battery <$60 delivered from USA

Floureon 7S 5000mah 25.9V 40C Lipo Battery <$60 delivered from USA

Recommended for rebuild of eZip 24V RMB battery packs.

Will fit up to 4 x 5Ah = 25.9V 20Ah vs oem 24V 10Ah (5-6Ah usable) SLA.

Every 24V controller I've ever tested works properly with 7s 25.9V battery, but a bit faster with some more torque ...

eZip RMB pack internal dimensions:

**150mm x 65mm x 230mm**

1 $60 brick = usable capacity of $120 SLA pack

2x ($120) = capacity of $570 10Ah oem Lithium RMB battery

4x ($240) @ 10lb = 2x $570 10Ah oem Lithium RMB battery or 4x $120 (65lb) SLA

(4x leaves room for 22mm x 650mm x 150mm BMS)

**Received 1 sample and began testing.**

(Dimensions confirmed and solid brick no noticed defects)

**#1 Tested shipped voltage of each cell.**

7 cells varied from 3.80V - 3.84V (.04V variance = reasonably equal)

**#2 Bulk charge to iMax Lion 4.10V**

2207mAh to average 4.07V

Additional Bulk charge to iMax Lipo 4.20V

776mAh to 4.168V-4.218V (.05V variance = reasonably equal for oem shipped but "poor" for "use")

**#3 Precisely equalized cell voltages**within .001V (4.159V- 4.160V)

1000th V meter recommended (Lucked into a $150 Fluke multimeter for $10)

**#4 Letting cells set to evaluate self-discharge**

100 hours 4.150V 4.158V - less than 100thV "self-discharge"

(variance is liable to be amplified charge\bleed down of cell voltages to match - "equalized" voltages were not "settled" results)

Will continue to compare voltages at 24 hour intervals until any self-discharge can be determined.

**update**- Self discharge tests

5 packs

Pack #1

14 days worst cell loss .027V

All cells within .013V

Pack #2

8 days worst cell loss .03V

All cells within .006V

Pack #3a

8 days worst cell loss .03V

All cells within .011V

Pack #3b

8 days worst cell loss .026V

All cells within .010V

Pack #4

4 days worst cell loss .018V

All cells within .005V

No cell seems to be of abnormal self discharge.

Self-discharge will be reassessed on a scheduled basis or if any indication deems necessary.

**#5 IR testing**(pending)

Will continuous discharge at 5A (1C) and monitor voltage sag as a measure of IR (Internal resistance)

Each cell will be metered under discharge and compared for equal IR

**#6**Will discharge to ~50% and precisely measure static voltage several minutes after voltage removed (pending)

Compared voltage will indicate comparative capacity

**#7 Will discharge further, at reduced rate, while monitoring all cell voltages**(pending)

.001V meter will be relied upon to determine capacity cliff @ ≤3.60V (unable to find oem discharge graph!)

**#8 iMax bulk charge to 4.10V Lion setting will indicate if all cells return to equal (balanced) voltage**(pending)

as safety before continuing with iMax 4.20V LiPO bulk charge setting

**#9 If battery prove of good-equal quality, I will create a capacity map to determine optimal charged and discharged voltages**(pending)

**update**

0.8C max recommended charge rate. ≤0.5C recommended for better life!

". Long cycle life (150 times minimum)" - moderate discharge rates combined with lowered charged voltage expected to extend cycles into the thousands! ... ?

". One-year battery warranty." - nice safety net!