This is the battery that came on my bike but I purchased a 630Wh battery not long after owning, it has only had 23 charge cycles so not had much use at all.  link to website and spec is shown below.

Pick up only due to Royal mail not liking Lithium Ion batteries.


SHIMANO STEPS Integrated Type Battery for Down Tube (504 Wh) | SHIMANO BIKE-EU


PRODUCT SPECIFICATIONS

MODEL NOBT-E8035-L
SERIESSHIMANO STEPS E8000 Series
ColorStandard
Average weight3.15
Remarks* BT-E8035-L for Japan (13 Ah, 468 Wh) ** By EC-E8004 (*** In case of 100 V AC) **** with SM-BTE80 or EW-CP100
ChemistryLi-Ion
PositionIntegrated
Rated voltage (V)36
Rated capacity (Ah)* 14
Rated capacity (Wh)* 504
Cyclelife span for charge (times)1,000 (more than 60%)
Time to charge (hour)|SOC = 100%** 4 (*** 4.5)
Time to charge (hour)|SOC = 80%** 2.5 (*** 3.2)
Charge level display✔
Error signal✔
Charging port** -
System on/off switch✔
Compatible battery mountBM-E8030-A BM-E8030-B BM-E8031-A BM-E8031-B
Compatible chargerEC-E6002, EC-E8004
Compatible adaptor for chargeSM-BTE80