VMAXTANKS MR-107, MB-107 and SLR-85 AGM Deep Cycle Batteries
VMAXTANKS MR-107, MB-107, and SLR-85 are BCI Size 24, AGM SLA deep cycle batteries.
These batteries feature a nominal capacity of 85 Ah and a nominal voltage of 12 volts. Physically they are very similar, but nonetheless, they also differ in several very important details depending on their intended purpose.
Updated: October 17, 2024.
VMAXTANKS MR-107, MB-107 and SLR-85 Features and Specifications
Physical dimensions of the VMAXTANKS MR-107, MB-107, and SLR-85 batteries are (W x D x H) 10.2 x 6.6 x 8.2 (8.5 with terminal posts) inches, and they weigh 55 pounds (~24.9 kg).
Due to their dimensions, these batteries belong to the BCI Group 24 and come with a pair of foldable handles for easier carrying.
VMAXTANKS MR-107, MB-107, and SLR-85 are Absorbent Glass Mat (AGM) Sealed Lead Acid (SLA) batteries that are designed to be spill-proof, with minimum maintenance during their lifetime.
Their nominal capacity (20h capacity) is 85 Ah, and their nominal voltage is 12 volts (6-cell AGM SLA batteries).
These batteries are generally designed as deep cycle batteries, but their features slightly differ according to their intended use, shown in the following chart:
| Model | VMAXTANKS MR107-85 | VMAXTANKS MB107-85 | VMAXTANKS SLR-85 |
| Nominal Voltage | 12 volts | 12 volts | 12 volts |
| Nominal 20h Capacity | 85 Ah | 85 Ah | 85 Ah |
| Reserve Capacity (RC) | 160 min | 170 min | 190 min |
| MCA | 700 Amps | - | - |
| PHCA | 1380 Amps | 1320 Amps | - |
| Intended Use | Deep Cycle and High-Performance Marine and Automotive Battery | Deep Cycle and High-Performance Medical Battery | Deep Cycle Solar Battery for the Off-the-grid Applications |
| Terminal Posts | 8 mm | 8 mm | 8 mm |
| Charging Current | 5 - 25 Amps | 5 - 25 Amps | 5 - 25 Amps |
| Charging Voltage | 14.4 - 14.9 volts | 14.4 - 14.9 volts | 14.4 - 14.9 volts |
| Float Voltage | 13.5 - 13.8 volts | 13.5 - 13.8 volts | 13.5 - 13.8 volts |
| Storage Temperature Range | -4 - 140°F (-20 - 60°C) | -4 - 140°F (-20 - 60°C) | -4 - 140°F (-20 - 60°C) |
| Charge Temperature Range | 14 - 140°F (-10 - 60°C) | 14 - 140°F (-10 - 60°C) | 14 - 140°F (-10 - 60°C) |
| Discharge Temperature Range | -4 - 140°F (-20 - 60°C) | -4 - 140°F (-20 - 60°C) | -4 - 140°F (-20 - 60°C) |
| Amazon Link | VMAXTANKS MR107-85 | VMAXTANKS MB107-85 | VMAXTANKS SLR-85 |
Note: Amazon links open in the new windows, feel free to check them for the most up-to-date offers and prices.
As one can see, although all three batteries are designed as deep-cycle batteries, MR107-85 has the best high-discharge performances, while SLR-85 has the best medium-to-low discharge performances.
How to Charge VMAXTANKS MR-107, MB-107 and SLR-85 Batteries
VMAXTANKS MR-107, MB-107, and SLR-85 batteries can be charged with:
- any smart AGM battery charger that can provide charging currents in the recommended range (5 - 25 Amps).
- vehicle and boat 14-15 volts alternator,
- solar panel and wind turbine in the 135 and 350 watts range. Note: SLR-85 (also often labeled as SLR85) can be charged using 90 watts solar panel if the Depth of Discharge (DoD) does not exceed 50%.
By using smart AGM battery chargers that monitor battery condition, charge it properly and maintain the charge, VMAXTANKS MR-107, MB-107 and SLR-85 batteries can easily achieve their advertised float service life span of 8-10 years.
Note: SLA AGM battery maintainers should be used only to maintain fully charged batteries.
One of the best and most popular advanced battery chargers is the NOCO GENIUS10 6V/12V 10A Smart Battery Charger (Amazon link, opens in the new window) which is designed to charge 6V and 12V lead-acid batteries including AGM, Gel-cell, Wet/Flooded, Enhanced, etc. and 12V Lithium Iron Phosphate (LiFePO4) batteries with the maximum charging current of 10 Amps.
Also, NOCO GENIUS10 can detect battery sulfation and can act as battery desulfator. After recharging the batteries, the charger automatically switch to the maintenance mode. NOCO GENIUS10 6V/12V 10A Smart Battery Charger can also be used as 12V power supply and for recovery of deeply discharged battery.
As such, the NOCO GENIUS10 is not the cheapest unit on the market, but it is nonetheless one of the most popular models in the 10A battery charger class.
VMAXTANKS MR-107 AGM Battery
VMAXTANKS MR-107 AGM battery is often labeled as MR107-85 or just MR107.
VMAXTANKS MR-107 AGM battery is a general-purpose deep cycle, high-performance battery that can be used even as a starting/cranking battery.
It features a Reserve Capacity of 160 minutes, which is slightly lower than MB-107 RC (170 min) and SLR-85 RC (190 min), but it features 700 Amps MCA and 1380 Amps PHCA (for 3 seconds).
Its recommended use is backup and alarm systems, as trolling motor batteries, as main batteries in smaller boats that have single battery electrical systems, as electrical vehicle batteries (current dependent), etc.
For more reviews and recommendations, check VMAXTANKS MR107-85 Amazon link (link opens in the new window).
VMAXTANKS MB-107 AGM Battery
VMAXTANKS MB-107 AGM battery, also known as MB107-85, or just MB107, features a Reserve Capacity of 170 minutes, which is 10 minutes longer than the MR107-85 battery.
VMAXTANKS MB-107 AGM Battery is intended for similar applications to the MR-107 battery but for slightly weaker currents.
Although it is described as 'Medical Battery' it can be used not only as wheelchair battery, but practically for all applications like like MR-107, just be aware of the currents.
For more reviews and recommendations, check VMAXTANKS MB107-85 Amazon link (link opens in the new window).
VMAXTANKS SLR-85 AGM Battery
VMAXTANKS SLR-85 AGM battery is intended for low Amps applications - it features the best RC value of 190 minutes, which is 20 minutes better than MB-107 and 30 minutes than MR-107 battery.
However, the VMAXTANKS SLR-85 battery should NOT be used as a starting battery, not even for very short periods. Such use can significantly shorten the operating life of this (and any other similar solar battery).
If you are looking for good and affordable SLA AGM battery for solar, off-the-grid and similar applications (for example, as deep discharge battery in two-battery electrical systems on the boats, RVs and similar), consider SLR-85 battery.
Also, if you have a backup or alarm system or trolling motor that requires less than 25 Amps, this battery is IMHO a better option than MR-107 or MB-107 batteries.
For more reviews and recommendations, check VMAXTANKS SLR-85 Amazon link (link opens in the new window).
Long Story Short: VMAXTANKS MR-107, MB-107, and SLR-85 batteries are sturdy and durable AGM SLA batteries with an expected/advertised float life of 8-10 years.
In real life, their operating life depends on the number and depth of discharges, quality of the charger, temperature and similar.
On average, these batteries can withstand ~280 cycles down to 100% DoD, ~460 cycles down to 80% DoD, ~680 cycles down to 50% DoD, etc., before experiencing a capacity drop down to 80% of nominal (85 Ah) capacity.
For more reviews and recommendations, check these Amazon links:
Of course, choose according to your personal needs and requirements.