The car is supposed to work with 6 AA-cells in series. Only rechargeable cells are an option here.
- Putting six of them in series, also adds all their source resistances in series. When high current is drawn, the current will sink a lot, leading to power loss
- The Goldpeak cells I use suffer from high self-discharge. Panasonic Eneloop should be better in this respect.
- Using a LiitoKala NCR18650B
- Charger : TP4056
- Protector : the single 8205A doesn't allow enough current. So the over-current protection had to be bypassed. This also disables under-voltage protection. When someone forgets to turn off the car, the battery will be drained to death (as has happened already)
- Boost circuit to boot the Li-ION cell voltage to 9V using XT1208 (advertised differently). This seems to work well.
Using the IOT-supply.