# Battery Maintenance
Lithium-ion rechargeable batteries are used for both the Turf Tank One, Base Station and Tablet.
It is normal for Lithium-ion batteries to get worn as they are used over time, and are thus expected to drop in capacity over time.
In general, this applies to any product using a Lithium-ion battery.
recommendation for battery maintenance
The following is recommended in order to preserve battery lifetime.
- Don´t let the battery run totally flat (0% capacity).
If possible, replace or charge the battery when 20% capacity is reached. - Store the battery at 25 celsius (77 fahrenheit) or cooler.
- Aim for 50% battery capacity prior to storing.
When working with products containing a Lithium-ion batteries the following must be considered, and is relevant to both the Turf Tank One Battery, Base Station and Tablet.
# Depth of Discharge
Depth of discharge is a term used to describe how much of the batttery is being used (drained) before recharging - typically expressed in percent. Running i.e. the Turf Tank One Battery down to 0% means 100% Depth of Discharge.
Depth of discharge is a high contributing factor to how many discharges cycles it is possible to get out of a Lithium-ion battery. Not only, for the Turf Tank One Battery or Base Station, but for all products using Lithium-ion batteries. Number of discharges cycles means how many times the battery can be drained and recharged.
In the table below, the relation between depth of dicharge and number of dicharge cycles is shown.
| Depth of discharge | Remaining capacity | Discharge cycles |
|---|---|---|
| 100% | 0% | 600 |
| 80% | 20% | 900 |
| 60% | 40% | 1.500 |
| 40% | 60% | 3.000 |
| 20% | 80% | 9.000 |
| 10% | 90% | 15.000 |
Example:
- if the battery is drained down to 0% capacity every time (entirely flat) the number of discharges is expected to be approx. 600.
- if the battery is drained down to 20% capacity every time then the number of discharges is expected to be approx. 900.
- if the battery is drained down to 40% capacity every time then the number of discharges is expected to be approx. 1500.
# Storage temperature and charge level
Lithium-ion batteries suffers from stress when exposed to heat, and so does keeping a high charge voltage. This is important to have in mind when storing (not using) a battery.
The table below shows the relation between storage temperature and charge level.
| Storage temperature | 40% charge | 100% charge (full charge) |
|---|---|---|
| 0 celsius (32 fahrenheit) | 98% (after 1 year) | 98% (after 1 year) |
| 25 celsius (77 fahrenheit) | 96% (after 1 year) | 80% (after 1 year) |
| 40 celsius (104 fahrenheit) | 85% (after 1 year) | 65% (after 1 year) |
| 60 celsius (140 fahrenheit) | 75% (after 1 year) | 60% (after 3 months) |
Example:
- Storing the battery for 1 year at 25 celsius with a 40% charge capacity will result in a 4% loss of capacity.
- Storing the battery for 1 year at 25 celsius with 100% charge capacity (fully charged) will results in a 20% loss of capacity.