Dogtra BP74TE3P vs BP37X850: Which Transmitter Battery Fits?
By Dogtra | Published: 2026-11-02
Category: Comparisons
Compare the Dogtra BP74TE3P and BP37X850 transmitter batteries by voltage, capacity, and compatible models so you pick the right replacement the first time.
Quick answer
Choose the BP74TE3P (7.4V, 800mAh) if you own a 1900S Black, 2700 T&B, 2702 T&B, or Edge/Edge RT transmitter. Choose the BP37X850 (3.7V, 850mAh) if you have a 280X transmitter or a 1900X receiver. The two are not interchangeable because their voltages and case sizes differ.
Voltage is the deciding factor, not capacity
The BP74TE3P runs at 7.4V while the BP37X850 runs at 3.7V. That difference is not a tuning preference; it reflects different internal cell configurations. Putting a 3.7V battery in a 7.4V transmitter will not power it correctly, and the reverse can stress the electronics. Always match the voltage printed on your original battery or in your transmitter's manual.
Capacity (800mAh vs 850mAh) affects runtime per charge, but it is secondary to voltage. A higher-capacity battery of the wrong voltage is still the wrong battery.
Where each battery fits in the Dogtra lineup
The BP74TE3P is listed for the 1900S Black, 1900S Black Edition B&L, 2700 T&B, 2702 T&B, Edge, and Edge RT transmitters. The BP37X850 is listed for the 280X transmitter and the 1900X receiver. These lists are specific: a 1900S Black transmitter and a 1900X receiver are different units and take different batteries.
If your model is not on either list, do not guess. Check the label inside the battery compartment or contact Dogtra support with your transmitter's model number before ordering.
Price and parts availability trade-off
The BP74TE3P is the higher-priced of the two at $17.50 (compared with a $34.99 catalog comparison price), while the BP37X850 is $12.50 (compared with $24.99). The BP37X850 also carries an OEM part number, AE1102338P, which can help if you are cross-referencing a dealer or repair invoice.
Neither battery is a universal fit. The lower price of the BP37X850 only helps if it matches your device; buying it for a 2700 T&B or Edge transmitter would be a wasted purchase.
Trade-offs at a glance
- BP74TE3P: higher voltage, more models: 7.4V and 800mAh, listed for six transmitter models including the 2700 T&B and Edge. It costs more than the BP37X850, but it is the only correct option for those transmitters. If your transmitter is a 2700 T&B or Edge, the BP37X850 is not a substitute regardless of price.
- BP37X850: lower voltage, lower price: 3.7V and 850mAh, listed for the 280X transmitter and 1900X receiver. It is cheaper and carries an OEM part number, but it will not power 7.4V transmitters. The 1900X receiver and 1900S Black transmitter use different batteries; do not mix them up by model number alone.
- Installation support: Both batteries are covered by Dogtra's step-by-step battery replacement video, so you can swap either one yourself without sending the unit in.
Product facts
- BATTERY BP74TE3P (7.4V 800mA) _2700T&B TRANSMITTER, EDGE TRANSMITTER: 7.4V, 800mAh; compatible with 1900S Black, 1900S Black Edition B&L, 2700 T&B, 2702 T&B, Edge, and Edge RT transmitters. This is the battery to order for those specific transmitter models, and the 7.4V rating is the key spec to match.
BATTERY BP74TE3P (7.4V 800mA) _2700T&B TRANSMITTER, EDGE TRANSMITTER - BATTERY BP37X850 (3.7V 850mA) _280X TX: 3.7V, 850mAh; compatible with the 280X transmitter and 1900X receiver; OEM part number AE1102338P. It serves two different device types, so confirm whether you are replacing a transmitter or receiver battery before ordering.
BATTERY BP37X850 (3.7V 850mA) _280X TX
Which battery should you order?
Choose the BP74TE3P if
- You own a 1900S Black, 1900S Black Edition B&L, 2700 T&B, 2702 T&B, Edge, or Edge RT transmitter
- You want to keep a spare for a high-drain 7.4V transmitter
Choose the BP37X850 if
- Your device is a 280X transmitter or 1900X receiver, which take the 3.7V battery instead
- You are trying to save money on a 7.4V transmitter; the lower price does not make it compatible
