48v, 40Ah (1.93kWh) Lithium Titanate Oxide (LTO) / Li₂TiO₃ Outdoor Rated Battery Wall with BMS – 22,000+ cycles!

In stock by March or April! These batteries assembled in Australia use Yinlong LTO cells. We are finalizing contracts to become a retailer presently and will release more information in the coming weeks, so check back soon! We aren’t yet allowed to use the brand name until we finalize the retailer deal, but we have vetted the product and company and are very impressed with the way these are built and have many on the way. NOTE: THIS IS A PLACEHOLDER IMAGE SIMILAR TO THE BATTERIES.

The exact price is still being worked out but it will be close to this. Yinlong cells are as tried, tested, and reliable as Toshiba cells but tend to cost less money per kWh. These batteries have a 20-year warranty due to LTOs being extremely long-lived (they’ll probably last well beyond the warranty) and will be CSA certified.

LTOs are the toughest, longest-lasting batteries you can get. Although you may not have heard of them, they've been around for over 20 years and have proven themselves for use in buses, off-grid power storage, and for car audio and electric car applications. They are extremely long-lived (over 20,000 cycles or 4 times more than Lithium Iron Phosphate/LFP, or 30 times longer than lead-acid or AGMs). Lithium titanate batteries can operate and charge at temperatures as low as -30℃ or less and are much safer than other chemistries (they can be punctured, burned, overcharged, and shorted out with no explosions or fires). These batteries can also be fully discharged without damage. This seems unbelievable, but it’s no joke: this is tried and tested tech – look it up!

Why haven’t you heard of these things? The only downside to this technology in the past has been that they are a bit larger (i.e. have lower energy density per weight/size), and have traditionally cost significantly more than other battery types. Luckily, their size has come down with the latest generations of technology, and with increasing economies of scale (higher production) prices are within the range of other inferior lithium iron phosphate (LiFePO4 / LFP) and lead-acid batteries. Until now, however, no one has made these cells into consumer-level batteries. For off-grid or backup power uses, it doesn’t matter that they are a bit larger as long as you have some space. Wouldn’t you rather use a bit more space and have a battery that will outlive you that your next of kin can inherit? These might be a bit more money upfront than some (but not all) LFPs, but they're actually the most affordable batteries you can buy by far in terms of cost per usable power throughout their life.

Key Features

• High stability and extreme longevity (22,000+ cycles!).
• Extremely safe: no thermal runaway or overheating, no lead (more environmentally safe).
• Low and high temperature charging, discharging, and storage (-30℃ to +60℃).
• Much faster charging potential compared to other lithium-ion batteries.
• No maintenance (e.g. no refills), no off-gassing, no temperature worries.
• Recharge efficiency exceeding 98% compared to e.g. 80% for AGMs.
• Extensive usability: can be used in solar and other energy storage power, solar hybrid street lighting, etc. Drop-in capabilities with most equipment such as Magnum inverters and Outback charge controllers. We’ll help you set your equipment to the right parameters.
• High quality Battery Management Systems that prevent overcharge, undercharge and ensure cells remain balanced inside batteries to increase battery life.

Note: If you research this battery chemistry further you will find a popular video of a fellow named Will Prowse saying that he doesn’t recommend the batteries because they are not efficient and are more expensive than LFPs. However, he did his tests on Grade B cells, and admits this later in the comments and in a subsequent video after testing Grade A cells, finding they are over 98% efficient. The only downside until now, then, has been the price and the slightly larger size. With these new more compact prismatic cells, they are only marginally larger than other chemistries, however, which doesn’t matter if you have even a bit of space to store them. Although they may not be good for most EVs as the primary battery due to this, they are amazing for off-grid or backup power uses in the home! Add to this the direct-from-factory prices we can offer, and there’s no reason to use anything else.

Specifications

Type: Lithium Titanate Oxide (LTO) / Li₂TiO₃

Nominal capacity: 11Ah

Nominal voltage: 48v

Standard Cycle life: 22,000+ cycles at 100% DOD

Operating temperature: -40°C to 60°C

Long Life

Batteries will maintain over 80% of original capacity after over 20,000 discharge and charge cycles even at high discharge and charge rates at 100% DOD.

Low-temperature operation

Batteries can be charged and discharged well below freezing (-40℃). There is virtually no degradation at low temperature even after repeated discharge, making batteries suitable for Canadian winters!

These batteries work with only certain inverters and charge controllers that can be custom set for their voltage range. Many can, but check your model against the specs.

Charging

50A, 2415W Continuous DC
38A, 1835W Pulsed DC
120A, 5796W Max DC, for 10s
56.0V High Cut-off Voltage
(ratings for 25°C ± 5°C)

Discharging

50A, 2415W Continuous DC
38A, 1835W Pulsed DC
120A, 5796W Max DC, for 10s
42.5V Low Cut-off Voltage
(ratings for 25°C ± 5°C)

Capacity & life

1.93 KWh (40Ah) Energy Capacity
100% Depth of Discharge
22,000 Cycle life (1C, 25°C ± 5°C)

Mechanical

1635 (h) x 155 (w) x 145 (d) 170 with wall plate) mm
-40°C to 60°C Operating Temperature
5°C to 35°C Recommended Operating Temperature
Outdoor IP65 Ingress Rating

Electrochemical

Lithium Titanate (LTO) Chemistry
48.3V Nominal Voltage
96% Round Trip Efficiency (1C, 25°C ± 5°C)
Wiring

2m 50A rated cable provided ready for wiring up​