Mighty Max ML5-6S 6V 5Ah Sealed Lead Acid Battery
Mighty Max ML5-6S is a rechargeable 6V lantern battery with spring terminals based on lead-acid chemistry.
Mighty Max ML5-6S is a sealed battery that can be mounted in any position, very resistant to shocks and vibrations, with a low self-discharge rate and high discharge rate, and good recovery after deep discharges.
Published: May 17, 2021.
Mighty Max ML5-6S Features and Specifications
Mighty Max ML5-6S features physical dimensions of (L x W x H) 2.63 x 2.63 x 4.50 (5.29 with terminals) inches (6.68 x 6.68 x 11.43/13.43 cm) and weighs ~1.88 pounds (~0.85 kg) - it is heavier than the typical non-rechargeable 6V lantern battery that weighs ~1 pound ±1 ounce (~0.45 kg ±0.029 kg).
Mighty Max ML5-6S features a nominal voltage of 6 volts and a nominal 20h capacity of 5 Ah - like all similar sealed lead-acid batteries, its capacity depends on the battery age, temperature, discharge current, and similar.
The internal resistance of the fully charged Mighty Max ML5-6S battery @25°C is 15.8 mΩ Mighty Max ML5-6S is not intended for cranking/starting applications - it is intended for deep cycle applications where discharge currents are not stronger than 2-3C (10-15 Amps max).
The following charts list the constant current and constant power discharge characteristics of the Mighty Max ML5-6S battery, measured at 25°C.
Constant current discharge chart:
| Battery End Voltage | Cell End Voltage | 5 min | 10 min | 15 min | 30 min | 1h | 2h | 3h | 5h | 8h | 10h | 20h |
| 4.80 | 1.6 | 17.95 | 11.45 | 9.22 | 5.58 | 3.10 | 1.72 | 1.23 | 0.84 | 0.54 | 0.46 | 0.24 |
| 5.10 | 1.7 | 17.07 | 10.86 | 8.85 | 5.35 | 2.98 | 1.70 | 1.21 | 0.83 | 0.54 | 0.45 | 0.24 |
| 5.25 | 1.75 | 16.54 | 10.52 | 8.62 | 5.22 | 2.91 | 1.68 | 1.20 | 0.82 | 0.52 | 0.44 | 0.24 |
| 5.40 | 1.8 | 16.01 | 10.19 | 8.40 | 5.08 | 2.83 | 1.66 | 1.18 | 0.81 | 0.53 | 0.43 | 0.23 |
Constant power discharge chart:
| Battery End Voltage | Cell End Voltage | 5 min | 10 min | 15 min | 30 min | 1h | 2h | 3h | 5h | 8h | 10h | 20h |
| 4.80 | 1.6 | 99.91 | 64.51 | 52.38 | 31.96 | 17.99 | 10.06 | 7.32 | 5.04 | 3.25 | 2.74 | 1.46 |
| 5.10 | 1.7 | 95.06 | 61.11 | 50.44 | 30.70 | 17.27 | 9.93 | 7.23 | 5.00 | 3.22 | 2.68 | 1.46 |
| 5.25 | 1.75 | 92.15 | 59.17 | 49.18 | 29.92 | 16.83 | 9.82 | 7.13 | 4.92 | 3.21 | 2.62 | 1.43 |
| 5.40 | 1.8 | 89.24 | 57.23 | 47.92 | 29.15 | 16.39 | 9.71 | 7.03 | 4.85 | 3.19 | 2.56 | 1.04 |
Thanks to such performances, Mighty Max ML5-6S 6V 5Ah battery is suitable for applications being powered by non-rechargeable 6V lantern batteries - for camping, for hunting/fishing, for off-the-grid applications, in emergencies, for medical/security systems, and similar.
If the Mighty Max ML5-6S battery is not connected to the smart battery charger/maintainer, it will self-discharge over time - it is a good practice to fully recharge the lead-acid batteries when they drop down to 20% DoD (or 80% SoC).
Self-discharge rate depends on the temperature, and the Mighty Max ML5-6S reaches 20% DoD/80% SoC after:
- 0°C: 16-17 months,
- 10°C ~9 months,
- 25°C: 6-7 months,
- 30°C: ~4 months,
- 40°C; ~2 months.
So, if You plan on storing the Mighty Max ML5-6S battery, be sure to store it in a cool area, preferably connected to a smart 6V lead-acid battery/maintainer.
How to Charge Mighty Max ML5-6S Battery?
Depending on its use, Mighty Max ML5-6S battery should be charged (@25°C):
- Cycle use: 7.25-7.5 volts, initial charging current less than 1.5A,
- Float use: 6.8-6.9 volts.
Again, this is a 6V battery, not a 12V battery. Personally, a good 0.5-1.0 Amps 6V smart lead-acid battery can recharge the Mighty Max ML5-6S battery quickly and keep it charged over a longer period of time.
Long Story Short: If You are looking for a rechargeable 6V lead-acid lantern battery, consider the Mighty Max ML5-6S battery.
It can withstand a large number of charging/discharging cycles, especially if it is not discharged below 50%, it also recovers well from deep discharges, it can provide relatively strong currents, it has a low self-discharge rate, etc.
For more reviews and recommendations, feel free to check the Mighty Max ML5-6S 6V 5Ah Battery Amazon link (link opens in the new window).