=== Nabijeni ===

https://www.powerstream.com/SLA.htm
https://www.energymatters.com.au/components/battery-voltage-discharge/

min charging: 2.15V


cyclic charge:
^Temperature^ charge per cell [V]^ charge 12V batt ^ gassing voltage cell ^ gassing voltage 12 V ^
| -20 °C * | 2.67 to 2.76 | 16.02 to 16.56 | 2.97 | 17.82 |
| -10 °C * | 2.61 to 2.70 | 15.66 to 16.2 | 2.65 | 15.9 |
| 0 ° C * | 2.55 to 2.65 | 15.3 to 15.9 | 2.54 | 15.24 |
| 10 °C | 2.49 to 2.59 | 14.94 to 15.54 | 2.47 | 14.82 |
| 20 °C | 2.43 to 2.53 | 14.58 to 15.18 | 2.415 | 14.49 |
| 25 °C | 2.40 to 2.50 | 14.40 to 15.00 | 2.39 | 14.34 |
| 30 °C | 2.37 to 2.47 | 14.22 to 14.82 | 2.365 | 14.19 |
| 40 °C | 2.31 to 2.41 | 13.86 to 14.46 | 2.33 | 13.98 |
| 50 °C | 2.25 to 2.35 | 13.5 to 14.10 | 2.30 | 13.8 |


standby use charge
^Temperature^ charge per cell [V]^ charge 12V batt ^ gassing voltage cell ^
| -30 °C * | 2.44 | 14.6 |
| -20 °C * | 2.34 to 2.38 | 14.04 to 14.28 | 2.97 |
| -10 °C * | 2.32 to 2.37 | 13.92 to 14.22 | 2.65 |
| 0 °C | 2.30 to 2.35 | 13.8 to 14.1 | 2.54 |
| 10 °C | 2.28 to 2.33 | 13.68 to 13.98 | 2.47 |
| 20 °C | 2.26 to 2.31 | 13.56 to 13.86 | 2.415 |
| 25 °C | 2.25 to 2.30 | 13.5 to 13.8 | 2.39 |
| 30 °C | 2.24 to 2.29 | 13.44 to 13.74 | 2.365 |
| 40 °C | 2.22 to 2.27 | 13.32 to 13.62 | 2.33 |
| 50 °C | 2.20 to 2.25 | 13.2 to 13.5 | 2.30 |

* Note that a fully discharged battery freezes solid at about 0°C, a fully
charged battery freezes about -72°C

^ Type: ^ Absorption Charging ^ Float Charging ^
| SLI/Flooded | 14.2V to 14.5V | 13.2V to 13.5V |
| Sealed | 14.2V to 14.5V | 13.2V to 13.5V |
| VRLA | 14.2V to 14.5V | 13.2V to 13.5V |
| AGM | 14.6V to 14.8V | 13.2V to 13.8V |
| GEL | 14.1V to 14.4V | 13.2V to 13.4V |

^ State of Charge ^ Flooded battery [V] ^ Gel battery [V] ^ AGM battery [V] ^
| 100% | 12.70+ (2.12) | 12.85+ (2.14) | 12.80+ (2.13) |
| 75% | 12.40 (2.07) | 12.65 (2.11) | 12.60 (2.10) |
| 50% | 12.20 (2.03) | 12.35 (2.06) | 12.30 (2.05) |
| 25% | 12.00 (2.00) | 12.00 (2.00) | 12.00 (2.00) |
| 0% | 11.80 (1.97) | 11.80 (1.97) | 11.80 (1.97) |

(AGM  Absorbent Glass Mat)

The figures are based on open circuit readings. That is, when the deep cycle battery isn’t under load and hasn’t been under load for a few hours. 

=== Various interesting stuff ===

http://wiki.diyfaq.org.uk/index.php/Lead_acid_battery_construction
https://www.instructables.com/Home-Baked-Kitchen-Battery/

https://www.rainingspiritdojo.com.au/downloads/alternativeleadacidsulphates-overview-dominichawkins-v1.5.pdf

=== Material ===

https://www.heureka.cz/?h%5Bfraze%5D=oloveny+plech&min=&max=&o=3

=== Desulfator ===
http://wiki.mypower.cz/desulfator

[[Desulfator]]